Therm-a-Rest invented the self-inflating mattress thirty years ago. And still today, Therm-a-Rest continues to be the most trusted name in outdoor comfort. Customers know when they purchase mattress pads from Therm-a-Rest, they are getting quality. Therm-a-Rest also manufactures pillows and portable chairs. Therm-A-Rest ProLite 4™ 1.5" Sleeping Pad - Regular. Our Fast & Light® mattresses offer unrivaled freedom. This is the lightest, most compact 4-season mattress. Therm-A-Rest Compressible Pillow™ Medium. This pillow takes up very little room in your backpack and yet,your head will rest peacefully. This pillow is perfect for everyone from trekkers and travelers to car campers. Therm-A-Rest Trekker Chair™ 20. This chair is lightweight, compact, and adjustable. Sets up fast.