If you're looking for a low-profile but super warm beanie, the Spitsbergen Hat from OR is the one. The 100% lambswool construction keeps your head toasty, while the GORE WIND STOPPER lining around the ear band repels heat-sapping gusts. We love this beanie for chilly nights around a campfire, and it usually can fit under a helmet if needed. The plush lambswool also makes this comfy for wearing at night if your need added warmth in your sleep system.