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Prism Optimus, Fall08 - A waterproof, primaloft-insulated bootie worthy of any alpine base camp.
With construction inspired by sleeping bags, this soft bootie is compressible and warm. The insulation is bonded to the fabric using ultrasonic welding; keeping the weight down and aiding waterproofing.
A pullcord at the heel cinches the internal instep lock down, for a secure fit.