Ultimate warmth. Designed for the coldest days and the biggest adventure. Olympus is our warmest baselayer offering unrivalled warmth to weight ratio and strategically placed mesh panels to ensure breathability. We use midweight 250 Merino Wool with added elastane so that Olympus will keep its shape and last longer. Full-length base layer legging Flatlocked seams to prevent friction Merino mesh panels behind the knee Fit: Slim Type: Merino Blend Weight: 250gsm Blend: 97% Merino Wool, 3% Elastane Inseam: (S): 68.5cm / 27.0" We&&';;ve always known Merino works. Now the lab coats agree. A new four-year PhD study, led by NC State University and The Woolmark Company, proves that Merino Wool outperforms polyester in moisture buffering by 96%. Merino Wool regulates heat and sweat naturally, no chemical tricks required.