Anatomic design and a shot of spandex allow freedom of movement in this moisture managing baselayer. Look good and stay warm with Hot Chillys` micro elite chamois! FEATURES: Flat seam construction to reduce bulk & abrasion Drop tail Features Hot Chillys flocked logo This style comes packaged in a box Flat Lock StitchingThis type of stitching creates a seam that lies flat within the garment rather than hanging from it eliminating discomfort associated with bulky seams. MTFMTF (Moisture Transfer Fibers) is made up of synthetic fibers that help wick moisture away from the skin to the outside of the garment where it can evaporate. UPFUltra-violet Protection Factor a rating system that measures the UV protection of which is provided by a fabric. Similar to the SPF rating system used in sunscreens.