There is a difference in moisture management performance apparel. WikMax works. WikMax with dual knit polyolefin/polyester technology blows away all other brands' single nylon/poly fabrications in moisture management. The difference and advantage is clear: you'll stay drier and more comfortable in both hot and cool conditions for maximum athletic performance. WSI took its amazing WikMax and added 4-way stretch compression combine to make a comfortable fitting tank.