evo.com | Mons Royale Long Underwear Tops > The MONS ROYALE Cascade Merino Flex 200 Long-Sleeve Top is made with merino wool to keep you warm and a 4-way stretch for added mobility. Designed to keep its shape and last longer compared to a traditional merino base layer, the Cascade is a go-to for the backcountry. Thumb Loops Flatlocked Seams Straight Hem Merino Flex 200 81% Merino Wool / 12% Nylon / 7% Elastane Slim Fit | Mons Royale Cascade Flex 200 Long Sleeve Top Men's 2026 - Small Black | Nylon/Wool/Elastane