Buffalo Systems were the originators of the Pertex/pile system and have been making jackets or "shirts" as they like to call them for over 30 years. Pertex is a densely woven fabric with high capillary action and when combined with any of the five Buffalo developed pile linings, a garment is produced which is windproof, warm, lightweight and resists rain. It is also highly breathable and extremely efficient at transmitting moisture vapour. So we just had to test this out!
Everything you wanted to know about Buffalo Sleeping Bags