These boots are sold in US youth sizes.

Alpinestars 2018 Tech 3S Youth Boots
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*2018 Tech 3S Youth Boot*
* Designed for junior riders
* Upper construction is made from innovative, lightweight microfiber material that is flexible and abrasion-resistant
* Light microfiber on the front and rear bellows for added comfort in the flex areas
* Toe box is made of synthetic material for high abrasion resistance
* Extended PU synthetic gaiter helps seal out water and dirt
* Contoured TPU calf guard, TPU higher medial guard, TPU outer lateral ankle guard and TPU heel counter for support and impact resistance
* Rear TPU gaiter patch applied on top of the TPU guard for added impact resistance and comfort on the rear flex zone
* Injected TPU shin plate is connected with the TPU medial guard panel
* Hook-and-loop upper boot closure with a TPR flap to fit a wide range of calf sizes while providing comfort and support
* TPU higher medial guard is designed with a technical texture for improved grip
* Biomechanical medial blade system allows good front/rear flex of the boot and provides support and impact resistance to the ankle
* Ergonomic TPU triple buckle straps wrap smoothly around the front flex area from the medial guard to the lateral side of the boot without compromising boot flex
* Boot closure system includes ratchet closure with memory system and a quick-release/locking system with a self-aligning design for easy, precise closure
* All buckles are replaceable
* Innovative one-piece TPU injected dual-compound foot shell is reinforced by a metal shank inside a co-injected toe reinforcement
* Soft foam surrounds the ankle and boot collar for comfort and shock-absorbing performance
* Boot has a textile lining for added comfort
* Replaceable anatomical EVA footbed
* Specially modified smaller footbed to accomodate growth and extended longevity of the product (kids boot sizes 2-5)
* High-grip rubber compound sole
* CE-certified to EN 13634:2010