Excellent top! The fit is fantastic! The body and sleeves are long enough and will not bulge. The zipper has a soft valve that covers it from the inside so it doesn't rub against your skin. There is also a small flap at the top of the zipper to prevent hair or skin snagging. The fabric is soft and perfectly wicks moisture away from the body. If you're looking for a zip-up base layer for a t-shirt, I highly recommend these!