A true performance piece Evident throughout the Specialized Element SL Pro Jacket is the quality of materials & design that have gone into making it. made from Event 310, a three layered fabric which will keep you comfortable as well as protecting you from the elements. The outer layer of the fabric is compact elastic & abrasion resistant polyester that has been treated with a water repellant. The inner layer is a soft brushed hydrophilic fabric that will wick moisture from your skin so you dont end up damp & cold. Lastly a breathable wind-proof & water repellant layer is in the center making sure the winter weather doesnt stop you. Two side openings with a hidden zipper allow you to have extra ventilation when needed, without having to open the full length zipper at the front. This will give you far more control over your temperature. Two rear pockets provide storage for those must-have essentials & they have been coated to protect anything stored from the inevitable mud & rain. Theres also an extra security pocket with a zipper for your phone or keys. Event 310 Fabric Wind-proof & Water repellant Side openings Description by Rebecca, Rutland Cycling e Commerce Team