The Arc'teryx Men's Gore Tex Mid Liner is sure to be a favorite at base camp whether you own the Bora2 Mid Backpacking Boot or not. This is the same Adaptive Fit liner already included with Arc'teryx's brand new top of the line footwear, featuring the same foot hugging comfort with breathable, quick drying mono mesh for a truly customized fit. Arc'teryx slipped Gore Tex's Performance Comfort Stretch membrane inside the Gore Tex Low Liner for extremely reliable waterproof, breathable protection. Unlike standard membranes that only provide partial coverage, Performance Comfort Stretch wraps entirely around the foot from top to bottom in order to maximize waterproof, breathable protection. The rubberized bottom lets you stroll around the campsite without your shoes, and it's always smart to have a spare if you do have the Bora2 Mid Backpacking Boot.