Absolute Zero is Mountain Hardwear's most advanced climbing parka for larger mountain guides and climbers. climbing the highest peaks in harsh conditions. We like it that its 800-fill down insulation is one of the highest and most compressible insulation materials available and Mountain Hardwear worked with Allied Down to ensure responsible sourcing and processing. Pertex Diamond Fuse shell offers superior abrasion and water resistance , and welded partitions enhance the overall waterproofness of the parka.