The secret to angler happiness on those fitful or downright ferocious weather days out on the fishing grounds? Layering, of course. And you can’t beat SIMMS for the very best in fishing base layers and mid-layers: just the thing to wear under our elite shells (or as standalone duds, depending on conditions). From moisture-wicking tops and bottoms to fleece pullovers, our fishing thermals ensure you can withstand the kind of back-and-forth temperature swings Mother Nature tends to serve up on more than a few casting days—giving you that much more opportunity to reel or pull in a beauty out of those promising depths. Layer up in style with SIMMS!Our men's base layering apparel and thermals are simply the best. Simms technical base layers are designed for fishing and under-wader insulation. Have product questions or need help choosing the perfect Simms layering, hoody, or clothing to suit your needs? Our Pro Staff of fly fishing experts is here to help you find the best Simms layering pieces to maximize your comfort and enjoyment on the water!