The Leatt MTB WindBlock 2. 0 Jacket is a wind jacket for fast XC and gravel rides when the chill sets in. Ultralight ripstop nylon blocks the wind with no membrane, so air still moves through the fabric, and a next-to-skin cut with 360 stretch follows the body in an aggressive riding position. What Our Gearhead(R) Experts Are Saying:"On a cold gravel climb I leave it zipped, and the mesh at the back and under the arms lets heat out, so I don't have to stop and peel it off. When the sun comes out, I pack it into the rear pocket and strap it to the bike."