Cotton type feel. I was afraid it was going to be the slick polyester feel and was extremely happy it was not. Nice and thin so it is perfect for a winter workout in the box. I am 6'6" tall and I was very pleased with the sleeve length. Not quite long enough but longer than all others. Keeps u warm before the workout but will the. Keep you cool in the middle of the WOD. I have the grey and plan on getting the green and the short sleeves when the summer hits.