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RIWI® Giant Building Blocks

RIWI® Giant Building Blocks

Build a Castle. Build a Fort. Build Memories. The ultimate life-sized building blocks for screen-free adventures.

EASTER DEALS: Up to $200 OFF
Thru April 6th — While Supplies Last
Set size
Regular price $159.95 USD
Regular price $199.95 USD Sale price $159.95 USD
Sale Sold out
Shipping calculated at checkout.

In stock & ready for playtime!

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The Screen-Free Fortress That Reclaims Your Living Room.

Build a Castle. Build a Fort. Build Memories.
RIWI® Giant Foam Blocks are the ultimate "energy burner" for active kids. Designed to spark imagination while promoting physical movement, we help children aged 3–12 build the impossible—safely and quietly.

Build Big. Play Hard. Breathe Easy.

RIWI® turns your home into an architectural lab where "I’m bored" disappears. We designed these giant blocks for tiny inventors who need to move—and for parents who want their living room back from toy clutter.

Why RIWI® is a Game-Changer for Your Home:

  • 🚀 The "Digital Reset": Solve the screen-time struggle instantly. RIWI encourages the kind of "energy-burning" movement kids usually only get at the park—right in your playroom.
  • ⏱️ Ready-to-Play in 2 Hours: Forget the 3-day expansion wait common with other foam brands. Our ActiveCore™ technology ensures your set is ready for building by naptime. (Blocks typically expand within minutes; however, depending on temperature and humidity, please allow up to 24 hours for full firmness.)
  • 🧼 The Deep-Clean Advantage: Because childhood is messy. RIWI is the only system where the foam itself is 100% machine-washable. Juice spills and allergies don't stand a chance.
  • 🇪🇺 European Trust: Crafted with Austrian engineering and EU safety standards, RIWI is the toxin-free, durable investment that grows with your child from toddler to tween.

Stop managing toys and start building memories. RIWI® is more than a set of blocks—it’s the foundation for your child’s wildest dreams.

Made in EU Soft & Quiet Play Daycare Approved STEM & Creativity Screen-Free Activity Non-Toxic & Safe

Frequently Asked Questions (FAQ)

(Click on the Question)

What is the recommended age for RIWI® Giant blocks?

RIWI blocks are designed for kids aged 3 to 12. Due to small parts (choking hazard), they are not suitable for children under 3.

Are these blocks safe for my home?

Absolutely. They are made from soft, child-safe foam with no sharp edges. They are also incredibly quiet—no loud crashes! Tested to ASTM F963 and CPSIA standards.

How do I wash the blocks?

Keeping them clean is easy! All RIWI blocks are machine washable. Just follow the care instructions included with your set.

Product Information

🧱 RIWI® Giant Building Blocks - the Original since 2017 - for play, fun & creativity!
• Block size: 28″ × 8″ × 4″
• Equal mix of blue, yellow, green & red
• Especially loved by children aged 3 to 12
• Lightweight, soft, and stable 
• Great for both indoor and outdoor play
• Made from our ActiveCore™ Foam - specially developed for kids' toys.

🏰 High-Friction Stability:Our intelligent surface structure allows blocks to stick together for stable fortresses without the need for scratchy velcro or heavy magnets. Easy for kids to handle, yet sturdy enough for tall towers.

🇪🇺 European Engineering: Designed in Austria and responsibly manufactured in the EU. 100% toxin-free and certified to the strictest US safety standards (ASTM F963 & CPSIA).

❤️ The Long-Term Investment: A toy that truly grows with your child. Perfect for ages 3 to 12. Trusted by educators, tested in daycares, and loved by over 85,000 kids worldwide.

Thanks to our newly developed ActiveCore™ technology, your blocks expand to full strength within minutes to a maximum of 24 hours after unboxing - no waiting 3 days like with other foam brands.

🎉 Grab your set now and experience the GIANT fun!

Care instructions

🧼 RIWI® foam building blocks are super easy to keep clean:
• Washable in the washing machine or by hand at 86°F
• Use a mild detergent – no fabric softener
• Gently squeeze out wet foam and let it air-dry lying flat – ideally on a drying rack with good airflow

That way, the blocks stay hygienic – even after wild playtime!

☀️ Sunlight advice: Since we deliberately avoid harmful substances, RIWI® foam can be sensitive to UV rays.
Feel free to use the blocks outdoors – but store them in the shade or protected after playtime.
Long exposure to direct sunlight may cause visible changes like yellowing – totally harmless, but noticeable.

Safety

🔒 Safety comes first at RIWI®
• Made from certified polyurethane foam – specially developed for children's toys
• Tested according to ASTM F963 (U.S. toy safety standard)
• OEKO-TEX® Standard 100 & REACH-compliant materials
100% free from harmful substances – soft, quiet, and perfect for playrooms
• Independently tested by TÜV AUSTRIA for EN71 (European toy standard) for safe and long-lasting play

⚠️ Warning: Not suitable for children under 3 years – choking hazard

Shipping

🇺🇸 Free shipping to US mainland over $99
💲 $19.95 shipping fee for orders under $99
🚚 Delivery time: 2–5 business days (from Texas via USPS Ground)
🌴 Hawaii, Alaska & US Islands: $149.95

- Outside of the US? -
Ships from Europe in 5–21 days
✈️ EU air freight:
 • $19.95 (Canada)
 • $19.95 (Mexico, Brazil, Argentina)

🧩 Note: Foam blocks may arrive compressed
Please unpack right away – full shape returns in up to 48 hours

🌍 For EU or Switzerland:
→ riwi-buildit.com | riwi-buildit.ch

Tax exempt order?

Please use our contact form for a tax exempt order. We will prepare an online checkout for you and email you the link to complete and pay the order online.

In order for us to prepare your order, we need:

  • your billing and shipping address
  • Email and phone number
  • the desired item including quantity

Unfortunately, we can only offer this to tax exempt companies. Please send us the exempt certificate as well.

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Building blocks kids love

All reviews

Our three children are always coming up with new ideas and love to just throw themselves into their work at the end to destroy everything. Even our youngest (1.5 years) can build her first structures because the blocks are so light.

— Benjamin

Great building blocks! What I particularly love: they are washable. If you lay them out flat to dry, they regain their shape perfectly. We have the 48-piece set and build huge caves where several children can fit inside.

— Family H.

We could throw out every other toy we own and my kids would still be happy because all they want to do is play with their RIWIs! It promotes imagination enormously—everything from caves to entire castles is possible.

— Lauren M.

By far the best investment for indoor play. These blocks are functional, well-made, and allow kids to tumble and climb safely without any hard edges. Finally, a solution that keeps them active and safe at the same time!

— Mary H.

Radiant children's eyes and huge building fun! The material is soft, light, and grippy—perfect for stacking. A highlight is letting a tower fall over together and landing softly in a mountain of blocks. Odorless and high quality!

— Philipp

Just purchased my second set. There are many companies out there—but buy the original. The quality, versatility, and the fact that it still looks great in our living room makes it worth every penny. Absolute recommendation!

— Tamara H.

Our three children are always coming up with new ideas and love to just throw themselves into their work at the end to destroy everything. Even our youngest (1.5 years) can build her first structures because the blocks are so light.

— Benjamin

Great building blocks! What I particularly love: they are washable. If you lay them out flat to dry, they regain their shape perfectly. We have the 48-piece set and build huge caves where several children can fit inside.

— Family H.

We could throw out every other toy we own and my kids would still be happy because all they want to do is play with their RIWIs! It promotes imagination enormously—everything from caves to entire castles is possible.

— Lauren M.

RIWI in action

By far the best investment for indoor play. These blocks are functional, well-made, and allow kids to tumble and climb safely without any hard edges. Finally, a solution that keeps them active and safe at the same time!

— Mary H.

Radiant children's eyes and huge building fun! The material is soft, light, and grippy—perfect for stacking. A highlight is letting a tower fall over together and landing softly in a mountain of blocks. Odorless and high quality!

— Philipp

Just purchased my second set. There are many companies out there—but buy the original. The quality, versatility, and the fact that it still looks great in our living room makes it worth every penny. Absolute recommendation!

— Tamara H.

All reviews

Washable Washable
Indoor Fun Indoor Fun
Creativity Creativity
Adventure Adventure
Family Time Family Time
Ultra Strong Ultra Strong

Why US Parents Choose RIWI:

  • Play-Ready in 2 Hours: Forget the 3-day expansion wait common with other foam brands. Our ActiveCore™ technology ensures your set is ready for building by naptime. (Blocks typically expand within minutes; however, depending on temperature and humidity, please allow up to 24 hours for full firmness.)
  • Deep-Clean Hygiene: While most play couches only have washable covers, RIWI foam is 100% machine-washable. Keep your playroom fresh and allergen-free, even after juice spills or wild adventures.
  • Premium European Engineering: In a market flooded with cheap imports, RIWI is engineered in Austria and made in the EU. 100% toxin-free, ASTM & CPSIA certified for your ultimate peace of mind. 
  • The Indoor "Energy Burner": The perfect tool for gross motor skill development. Let them climb, jump, and crash safely on rainy days without the noise or the broken furniture.
  • 24-in-1 Play Couch Utility: Stop the playroom clutter. When play ends, our Couch Cover system allows 24 blocks to "disappear" into a functional, stylish sofa for your living space.
  • Built for "Inspiring Inventors": A high-impact STEM investment that grows with your child. Foster architectural confidence and independent, screen-free play from ages 3 to 12.

Less screen time. More free, creative play.

Real play, movement and togetherness.

RIWI® – the smarter choice!

✅ RIWI®

  • ✔️ Made in Europe
  • ✔️ TÜV tested, toxin-free
  • ✔️ Durable & premium quality
  • ✔️ Boosts creativity & movement
  • ✔️ Kids love them for years
  • ✔️ Machine washable
  • ✔️ Over 50% cheaper with top quality

❌ Other toys

  • ✖️ Mostly imported from China
  • ✖️ Doubtful quality & safety
  • ✖️ Break easily
  • ✖️ Limited play options
  • ✖️ Kids lose interest quickly
  • ✖️ Hard to clean
  • ✖️ Expensive & inflexible

RIWI® means top quality at a great price – durable, fun, and safer than most. For creative play at home – no compromises.

Family playing with colorful RIWI building blocks in a living room

Over 85,000 parents trust RIWI®

Since 2017, more than 2 million building blocks have been sparking joy in children every single day. Over 95% of surveyed families say RIWI is their kids’ favorite toy and a true highlight during every visit. Creativity and joy that spread.

RIWI® FAQ – Frequently Asked Questions

🛡️ How safe are RIWI®️ blocks?
Very safe – and that’s especially important to us. Our blocks are made of a special foam developed specifically for children's toys. They’re tested to US ASTM F963 standard, the European EN71 standards, and OEKO-TEX Standard 100 – all certified by the independent testing institutes, like TÜV Austria. Plus, every block is made in the EU – for trusted, certified quality.
🧼 How do I clean the blocks?
Cleaning is easy – either in the washing machine or by hand. Please don’t use fabric softener and opt for a child-friendly detergent. This way, the blocks stay beautiful and safe for a long time.
👉 Watch how it’s done here
🏕️ Can the blocks be used indoors and outdoors?
Yes – RIWI®️ blocks are perfect for indoor use. For outdoor use, we recommend our PU covers especially for XXL blocks. These make the blocks more durable, weather-resistant, and hygienic – ideal for intense outdoor play.
🏠 Are the blocks suitable for small apartments?
Yes! Despite their size, RIWI® blocks are easy to stack and store. For 24 XXL blocks, our clever RIWI Couch Cover transforms them into a comfy play couch with storage space. For 12 XXL blocks, the RIWI XXL Bag is perfect – practical and compact. Great for storage, transport, or a space-saving seat in the kids' room.
🧮 How many blocks do I need?
👶 12-piece set: ideal for starters
👨👩👧👦 24-piece set: bestseller for 1–2 children
🏡 36-piece set: great for larger play areas
💇️ 48-piece set: huge building fun for the whole family
🎨 Why are RIWI®️ blocks ideal for my child?
RIWI®️ is more than a toy. It grows with your child, encourages motor skills, creativity, and independence. The soft specialty foam is safer and quieter than wood or plastic – making RIWI a great alternative to screen time.
🧱 How does RIWI®️ make building simple and stable?
RIWI®️ blocks are made of a special foam with high friction. This helps them stick together when stacked, so they don't slide apart.
📦 How are the blocks delivered?
Depending on the set size, our blocks are compressed with a special machine and shipped space-saving by parcel. Once unpacked, they expand back to their original shape on their own.
🧳 Where do I store the blocks after playing?
For XXL blocks: The RIWI Couch Covers turn 24 XXL blocks into a cozy play couch with built-in storage – perfect for sitting, playing, and tidying up. For 12 blocks, the RIWI XXL Bag is the ideal solution – neat, practical, and space-saving.
💼 Can I buy on invoice? (B2B only)
For businesses, kindergartens, and public institutions, we offer payment by invoice. Please use our order form. Available for business customers only.