Small: 6 3/4(US) - Head Size:21" (53 cm)
Medium: 7(US) - Head Size:22" (56 cm)
Large: 7 3/8(US) - Head Size:23" (58 cm)
X-Large: 7 5/8(US) - Head Size:24" (61 cm)
Weight: 2 oz. (57 g)
Packed Size: 6" x 3" (15 x 8cm)
The Primalid was simply designed to keep your head warm. A layer of 100g (3 oz) Primaloft Sport keeps the heat in and the Pertex microfibre shell keeps the wind and rain out. The band of the Primalid is made from two layers of 4-way stretch fleece for a comfortable fit.
To determine your correct size, place the measuring tape around your head about 1/8" above your ear, across the mid-forehead, completely circling your head. Compare this result to the Head Size listed below.