Built to keep you comfortable through long days wading cold water, the Fusion 90 Pant is a one-of-a-kind full-stretch, air-permeable insulated pant. Designed to be worn under RS Waders, the Fusion 90 adds functional performance to the comfort of puffy pants by incorporating Toray's® proprietary Primeflex™ outer fabric and 3DEFX™ stretch insulation. Articulation in the legs increases mobility when wading from pool to pool, and a tapered leg design means they won't bunch or ride up under your waders. These are fully insulated, breathable pants that move like running pants and never get clammy underneath. Featuring a structured waistband with an integrated belt so they stay in place, two insulated jean cut pockets that you can access under your waders, a zippered rear pocket, a zippered thigh pocket, and zippered fly for easy streamside relief. The Fusion 90 are the most comfortable pants you've ever worn under your waders.