Wondering why Spyder calls these pants the "Seventy"? Us too... What we do know, however, is that the Spyder Seventy Pants are their best-selling freeski style pants thanks to their flattering fit and gimmick-free simplicity. Constructed from recycled polyester with a 10K/10K waterproof, breathable laminate along with a light layer of Dupont insulation to eliminate chills without overdoing it, the Seventy Pants fit the needs of the vast majority and do so in a way that's distinctly Spyder.