Outdoor Research Women's Alpine Onset Merino 150 Bottoms The Alpine Onset 150 Base Layers are a lightweight insulator, featuring soft merino wool blended with recycled polyester for superior moisture wicking and durability and are the foundation for an elite performance outerwear kit. Elite Lightweight Layering Foundation With Merino Wool And Recycled Materials. Combining the naturally anti-odor properties of merino wool, and the added durability of recycled polyester, the lightweight Alpine Onset Merino 150 wool base layers are an easy choice for winter layering without overheating. Ideally worn directly next to the skin, and built with a no-chafe flat seam construction, the naturally anti-odor properties of these layers make them an excellent choice for multi-day trips, extended backcountry adventures, and activities where layering up without overheating is paramount. An essential collection, the Alpine Onset Merino 150 base layers are the foundation upon which great performing outerwear kits are built. Specs: Fabric: 47% Merino Wool 47% Recycled Polyester (Reprieve) 6% Elastane Jersey Weight: 5.9 oz/ 167 g Design Features: Flat-Seam Construction Elastic Logo Waistband Gusseted Crotch Outdoor Research Women's Alpine Onset Merino 150 Bottoms