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Installed these in my Sideral 2.1 boots and the difference in warmth is immediate—my toes stay cozy even on single-digit days. The fit is snug without being tight, which makes long days on the mountain much more enjoyable.

The Sideral 2.1's stock liner always left my toes cold, but this replacement changed that immediately. The extra density around the ankle locks my heel down better too, making the boot feel snugger than before.

Pulled these out of the box and installed them in my boots without any trouble—they’re noticeably thicker than the stock liners. First day out, my toes stayed warm even on the chairlift in single-digit temps.