Spring skiing or summer camping? The Women's Classic All-Season Merino Base Layer Long Sleeve is designed for both due to the versatility and temperature-regulating properties of our Merino fabric. We use Raglan sleeves that eliminate shoulder seams, smooth flatlock seams to help prevent chafing, and Core Spun technology for increased durability. But don't fret. You'll still feel the unmatched comfort of responsibly sourced Merino wool directly on your skin.