These gloves consist of a stretchy spandex type material on the backs and synthetic leather / suede palms and thumbs. There is no velcro strap to release them so you have to just stretch them on and off. This makes the gloves a little difficult to remove after a ride. According to the size chart, my hands were on the small side of 'medium' but I wish I'd gotten a large.
Aside from the sizing issue though, I do believe that these gloves leave me with less hand numbness than others I have tried from Pearl Izumi and Giro, which was the main thing I was after. Also the acid green color is nice and visible for hand signals.