Bootcap 2.0 - WhiteBootcap 2. 0 White Stay warmer. Ski longer. Made of high density foam, bootcap keeps skiers feet 20 F warmer without batteries or other electronics. The brainchild of ski industry veterans, bootcap adheres directly to the outside of a ski boots toe box, providing instant insulation and warmth. A solution so simple, we were surprised it hadnt been invented already! How It Works Optimized Fit With a tapered bottom edge, bootcap stays attached during