Tim Waggoner (“Lucho”), a former top-level Ironman triathlete and current coach, ultrarunner and podcaster on Endurance Planet, recently cut up a smaller plastic bottle in half and used the two halves as makeshift windblockers. They don’t cover the tops of his hands though.
Besides the problem of the sharp edges of the plastic, it seems that the plastic bottles wouldn’t keep out the cold as well as the neoprene versions do. Bar Mitts aren’t 100% effective but they do help a lot.
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