At first glance, the Siv is a throwback to a time when gloves were truly simple. But under the hood is a thoroughly modern glove with a perforated nylon mesh upper that’s cut to wrap the hand like a second skin, and a tailored Super Fit microfiber palm to enhance grip and control. It’s a timeless combination that definitely improves a classic design.Super Fit Engineering is a proprietary process that guides the fit, design and patterning of every Giro glove for maximum comfort and performance. By carefully tailoring the palm, fingers and padding zones to match the shape and size of the hand, Super Fit Engineering reduces bunching and discomfort while enhancing grip, bar feel and the effectiveness of the padding. And with as many as six sizes available per model, almost any rider can great pair of gloves to match their needs.Key Features:Palm: Super Fit Engineered Three-Panel Design, Microfiber Palm, Sonic-Welded Pull Tab - 92% Polyester, 8% Spandex,Upper: Moisture-wicking, 4-way stretch, Breathable Mesh, Highly Absorbent Microfiber Wiping Surface, Low-Profile Velcro Closure -93% Polyester, 7% Cotton,Padding: Optimized EVA Padding - 100% Rubber.