Made from our revolutionary, Merino x Compression fabric, our Pace Arm Warmers are ideal for changing weather conditions and trans-seasonal weather. They help keep you warm in low temperatures, but are easily rolled down or removed completely if it warms up. This fabric has a high merino content so they will outperform regular synthetic arm sleeves, and are fully breathable to help stop you overheating, lightweight for warmth without bulk, and deliver UV protection as well. Pair with an io t-shirt and you’ve got a super warm, comfortable and versatile combo. These feature: Revolutionary Merino X Compression fabric Tag-free labels and flatlock stitching to eliminate chafe and maximize comfort Silicone grippers at the inside top hem to hold them securely in place around your arm Reflective trims for added visibility in low light conditions. SIZE & FIT Male model is 6'2" and wears size L. Female model wear size XS. Model is size 6-8, height 170cm, chest 81cm, waist 63.5cm, hips 89cm Choose size based on what base layer top size you wear, or view size chart here Size Guide. Contact Fit. BEST FOR Running Cycling