Merino wool has long been a waterfowlers best friend for its thermal properties when wet and natural anti-odor qualities. Perhaps the only drawback to merino knits is that, like most other knit fabrics, they are prone to snagging, picking, and pilling.Through years of development, First Lite has built a robust double-knit wool fabric that is both durable on the exterior and soft on the interior, bridging the gap between base layer and outerwear.This new fabrication has been fittingly dubbed Rugged Wool and its franchise of products are designed to take you from the house to the field and everywhere in between.Where to UseRegions: Pacific Northwest Southwest Midwest Southeast NortheastTemperatures: Below 20F 20F - 45F 45F - 60FPrimary Usage: WaterfowlLayering Position Midlayer Fit-to-Kit: Sized to wear over merino base layer and under transitional midlayers or outerwear and/or waterproof outerwear