The Kilpi NIELO-M men's underpants are designed for active men who want to stay warm and dry even during demanding performance. Ideal under ski or outdoor pants. Key features: Snug sporty fit. Functional material with OPTI-DRY technology. Seamless, SEAMLESS design for maximum comfort. Great as a base layer. The Kilpi NIELO-M will keep you warm even during a day in the mountains.