Rab Ultrasphere 4.5 Arcteryx Vertex Alpine GTX which serves as an effective

which serves as an effective manual thermostat for rapid ventilation when the intensity peaks or the sun hits the south face

With a compact

Perfect for spare guy lines

and the technical fit is designed for comfort under a harness and backpack

Rab Ultrasphere 4.5 Arcteryx Vertex Alpine GTX which serves as an effectiveRab's TILT heat reflective technology which bumps up the warmth while adding a negligible amount of weight. The Ultrasphere 4. 5 is designed to be used in conjunction with Rab's Mythic Ultra 120 Modular sleeping bag, but is actually a great, superlight and warm mat on its own. Inside the Ultrasphere 4. 5 is two layers of Rab's TILT reflective film which reduces radiant heat loss without adding weight or bulk and does not rustle at all like other heat