ULTIMATE WET-WADING PANTS FOR MARATHON MISSIONS WHERE MASSIVE MOBILITY MATTERS. Simms' UPF 50 Arapaima Pants are cut from two-way stretch fabric, with articulated, mobility-enhanced knees. Wet wade all day with a water-shedding, quick-drying nylon/5% spandex blend, and source superior moisture management via a brushed tricot-lined waistband. Two zip-secure thigh pockets keep essentials in check. And self-fabric overlays on the hand pockets enhance abrasion resistance.