Incorporating the highly breathable and waterproof XCR membrane from GORE-TEX, the Sierra shoe is extremely durable and rugged, offering bags of protective features built into its subtle outdoors design. With a technically constructed upper and Alpinestars exclusive rubber compound sole, the Sierra is constructed to handle extreme temperature conditions.
Technical main upper construction featuring combined microfiber, durable synthetic leather panels on the heel and toe, breathable mesh inserts and TPU reinforcements for an extremely comfortable and hard-wearing boot.
Ergonomic forefoot shaping design for better grip on the bike's controls.
Padding on tongue and collar provides high levels of comfort and fit around the ankle and instep.
3D mesh lining is strategically placed on the collar and top tongue area to provide high levels of breathability.
Incorporates GORE-TEX waterproof and extremely breathable performance membrane XCR, which is optimized for use in temperature extremes, on or off the bike.
Flex insert on Achilles heel provides riding comfort and maneuverability.
Secure, personalized and convenient closure fit thanks to lacing system and adjustable PU-tipped Velcro brand hook-and-loop strap across lower shin.
Double density TPU ankle protector disks are layered under the upper for excellent protection against knocks.
External TPU shift pad for durability and grip on bike's controls.
External TPR guards on the lateral and medial side help protect against abrasion and knocks.
Internal toe box and heel counter are layered under the upper for more ergonomic design.
Alpinestars exclusive rubber compound sole features performance sculpturing for excellent grip, flex and durability.
Removable and replaceable EVA and Lycra foot-bed is anatomically profiled for added comfort and support.
Hi-Vis reflective panel on rear improves visibility of rider.