What Our Gearhead(R) Experts Are Saying:"I wore the RFL Thermolite OTC Ultra-Lightweight Sock for a full day of lift laps and never felt a single seam or bunch inside my boots. My feet stayed warm without ever feeling overheated, even after hours on the mountain."A boot that fits right starts with a sock that disappears, and the RFL Thermolite OTC Ultra-Lightweight Sock from Darn Tough is built to do exactly that. Picture buckling into your boots at the base of the lift, feet settling in smooth and snug, nothing bunching or shifting as you carve into your first run of the day. The synthetic Thermolite fibers keep things light and insulating without adding bulk, while the True Seamless Toe technology closes off any pressure points before they start. A reinforced Achilles panel cuts down on heel lift, so the fit stays locked in from the first chairlift to the last run, run after run.