Designed for high-output days in frigid weather, the Flatiron Merino Crew Thermal Shirt for Men combines elite comfort with performance-grade materials. Crafted from 185 gsm Nuyarn® merino wool, it offers an unbeatable warmth-to-weight ratio and dries up to five times faster than traditional merino.
- Premium merino wool shirt with 18-micron non-mulesed wool for itch-free comfort
- Eyelet paneling and gusseted underarms for breathability and freedom of movement
- Flatlock seams eliminate irritation, making this an ideal base layer under ski or hiking gear
- Slim Tech Fit designed to layer smoothly under outerwear
- Quick hang-dry loop for travel-friendly wear
Whether you’re exploring backcountry trails or commuting in cold city weather, this shirt stands out as one of the best thermal shirts for men.
Peggy Young (verified owner) –
I bought this after reading reviews of merino wool base layers and it lives up to the hype. Keeps me warm without overheating.
Lynn Sullivan (verified owner) –
I wear this men’s long sleeve performance shirt for trail runs in chilly weather—great stretch and stays dry.
Savannah Pratt (verified owner) –
One of the best thermal shirts for men I’ve owned. Lightweight, super soft, and perfect under my ski shell.