Assos winter thermax airblock overshoes assos winter overshoes are your perfect companions in fall and winter winter overshoes are particularly efficient when paired with assos winter socks made from airblock 851 and thermax fabrics winter overshoes have two openings one for the pedal cleat and one for the heel as well as a long heel zip airblock 851 on the forefoot offers superb wind protection material 54 polyamide 36 polyester 4 elastane 4 polyurethane 2 lyocell size guide