{"product_id":"sidi-crossair-x-hd-enduro-hyper-extension-system-boot-accessories-2428-0005-39-hh","title":"Sidi Crossair X\/HD Enduro Hyper Extension System Boot Accessories","description":"\u003cp\u003eSidi Crossair X\/HD Enduro Hyper Extension System Boot Accessories\u003c\/p\u003e\u003cp\u003eThe SIDI Hyper Extension System is engineered to help reduce the risk of ankle and foot overextension during demanding off-road and motocross riding. This replacement block system plays a critical role in controlling rearward movement, adding an extra layer of protection without restricting natural mobility. Designed to maintain the structural integrity of your boots, it allows you to replace worn components and keep your gear performing as intended. Hardware is included for straightforward installation.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHelps limit ankle and foot hyperextension\u003c\/li\u003e\n\u003cli\u003eSupports boot structure and protective performance\u003c\/li\u003e\n\u003cli\u003eMaintains flexibility while enhancing stability\u003c\/li\u003e\n\u003cli\u003eReplacement component for worn or damaged parts\u003c\/li\u003e\n\u003cli\u003eIncludes hardware for easy installation\u003c\/li\u003e\n\u003cli\u003eSIDI Reference #: 345\u003c\/li\u003e\n\u003cli\u003eColor: Black\u003c\/li\u003e\n\u003cli\u003eSize: 37-39, 40-41, 42-43, 44-45, 46-47, 48-50\u003c\/li\u003e\n\u003cli\u003eSKU: 2428-0005-39, 2428-0005-41, 2428-0005-43, 2428-0005-45, 2428-0005-47, 2428-0005-50\u003c\/li\u003e\n\u003cli\u003eFitment: Crossair, Crossair HD Enduro, Crossair X\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sidi","offers":[{"title":"Black \/ 37-39","offer_id":47930362364089,"sku":"2428-0005-39-HH","price":8.99,"currency_code":"USD","in_stock":false},{"title":"Black \/ 40-41","offer_id":47930362396857,"sku":"2428-0005-41-HH","price":8.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ 42-43","offer_id":47930362429625,"sku":"2428-0005-43-HH","price":8.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ 44-45","offer_id":47930362462393,"sku":"2428-0005-45-HH","price":8.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ 46-47","offer_id":47930362495161,"sku":"2428-0005-47-HH","price":8.99,"currency_code":"USD","in_stock":true},{"title":"Black \/ 48-50","offer_id":47930362527929,"sku":"2428-0005-50-HH","price":8.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1223\/6434\/files\/accessories-sidi-boot-hyper-extension-system-black.jpg?v=1783049462","url":"https:\/\/motorhelmets.com\/products\/sidi-crossair-x-hd-enduro-hyper-extension-system-boot-accessories-2428-0005-39-hh","provider":"Motorhelmets.com | Shop for Moto Gear","version":"1.0","type":"link"}