Thermoball™ Unwavering warmth in the wet: Stay warm, dry and mobile with Thermoball™ insulation. Unlike traditional, continuous-filament synthetic insulations, the small round synthetic fibre is closely clustered to mimic down clusters, trapping heat within small air pockets to retain warmth. The benefit of this synthetic alternative is that it delivers high warmth even when it gets wet. The lightweight construction helps nurture activity hour after hour and provides greater mobility across challenging terrain.

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