S Liner

$111.6 ~~$180~~ In stock

The S Boot Liner works with the La Sportiva Sideral 2.1 and Starlet 2.1 ski boots to provide additional comfort and warmth. This is a replacement liner.

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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Delivery costs

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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Returning an item

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (5.0 / 5 · 5 reviews)

Jacob O. ★★★★★ Oct 21, 2026

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.

Sofia ★★★★★ Oct 20, 2026

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.

Lily R. ★★★★★ Oct 19, 2026

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.