Patagonia's warmest fleece, a combination of high-loft Polartec® Thermal Pro® and Polartec Power Stretch® allows for complete freedom of movement. 

Quite simply this is THE fleece to wear under your shell.

• Extremely warm and superlight, high-loft directional knit provides maximum warmth-to-weight ratio, wicks moisture and speeds dry time
• Polartec Power Stretch fleece stretch panels provide great fit and durability in high-wear areas
• Microfleece-lined collar, cuffs and hem enhance comfort
• Stretch-woven chest pocket for quick-access storage
• Pockets: Two handwarmers; one external stretch-woven, zippered chest for quick access storage
• Drawcord hem helps reduce heat loss and trap warmth
• Body: 7.4-oz Polartec® Thermal Pro® 98% polyester (70% recycled)/2% spandex. Side panels: 6.6-oz Polartec Power Stretch® 88% polyester (60% recycled)/12% spandex. Chest pocket: 4.9-oz 95% polyester/5% spandex
• 473 g (16.7 oz)