2020 Sun Mountain RainFlex Pant The Sun Mountain RainFlex Pant is fully seam-sealed and waterproof, RainFlex rain gear is constructed with a 4-way stretch knit fabric that is breathable and quiet. RainFlex is, in a word, playable. Features: Sun Mountain RainFlex Pant Partial elastic waist with zipper fly and belt loops Snap system at hem shortens pants 2.5 inches Lower leg zippers Zippered wallet and hand-warmer pockets Two-year waterproof guarantee