Sports Research, Sweet Sweat Arm Trimmers, Unisex-Regular, Yellow, 1 Pair

The name is very appropriate for this product. They will help you to increase the amount you sweat while working out. They seem to be made very well, with quality materials. The outside is soft neoprene, and the inside is a soft rubbery like textured material. They are a little tricky getting on by yourself and getting them placed correctly with the right amount of pressure. I have very small arms, so I haven't really had any size difference since using these. I got them to help increase the amount I sweat while working out though, not to decrease my arm size. They do exactly what I wanted. They come with a mesh bag for washing or carrying. They are also very comfortable and did not cause any issue with lifting weights. They stayed in place very well the whole time. I am very happy with this product.