If you need protection and warmth for cold-weather riding but don't want to end up overheating, the Wind Pro(R) Knee Warmers are the solution. The warmers are made with Light Wind Pro(R), a Polartec(R) fleece that adapts to an incredibly wide range of conditions thanks to wind-blocking properties, extreme breathability and Durable Water Repellent treatment. The tight construction of this fabric's proprietary yarns blocks the wind four times more than traditional fleece to greatly reduce the effects of wind chill, but because it is not a laminate, it is highly breathable and maintains 85% breathability compared to traditional fleece, to help prevent overheating. Features: - Warmers Fabric: Polartec(R) Light Wind Pro: 4-way stretch wind-breaking and breathable hard-face knit with brushed back - Warmers Leg Finish Tighs: Super Light Grip at tight - Warmers Seams: Flatlock seams - Warmers Sun Protection: UPF/SPF 50 - Warmers Visibility Features: Reflective accent - Weather: Chilly/Wind Sizing (Thigh measurements): - XS: 19.5-21 in. / 25.5-28 cm. - S: 11-12 in. / 28-30.5 cm. - M: 12-13 in. / 30.5-33 cm. - L: 13-14.5 in. / 33-35.5 cm. - XL: 14.5-16 in. / 35.5-40.5 cm.