Synthwave Two Piece Compression Suit64 Degree Racing Suit Types: XC 1: The XC 1 features under arm, back of neck and belt line ventilated patches, silicon no slip strip along the waistline, and a ventilated expansion zone in the collar. Constructed with high quality Italian Lycra and double stitched for durability. XC1 LW: Features under arm, back of neck and belt line ventilated patches, silicon no slip strip along the waistline, and a ventilated expansion zone in the collar.