Icebreaker Men's Merino 260 Tech Thermal Long Sleeve Base Layer

Icebreaker’s Merino 260 Tech Thermal Crew is a men’s long sleeve base layer made from 100% merino wool. Built as a heavyweight option in the brand’s merino range, it uses 260gsm material and a slim, fitted cut for cold-weather layering across alpine sports, winter trekking and high-altitude use.

A crew neck and next-to-skin feel are paired with strategically placed flat seams to help reduce chafing when worn under additional layers. The longer body length adds coverage during movement, while pre-shrunk merino fibres support shape retention and a consistent fit. The merino wool construction is breathable and temperature regulating, with odour-resistant and antibacterial properties. Machine washable at 40°C.

Key features

• Material: 100% merino wool
• 260gsm heavyweight construction
• Slim, fitted base layer cut
• Strategically placed flat seams
• Longer body length for added coverage
• Pre-shrunk fibres for shape retention
• Breathable and temperature regulating
• Machine washable at 40°C

Sizing

• XS: chest 33–35 in, arm length 33.5 in
• S: chest 35–37 in, arm length 33.8 in
• M: chest 37–40 in, arm length 34 in
• L: chest 40–43.5 in, arm length 34.3 in
• XL: chest 43.5–46.5 in, arm length 34.5 in
• XXL: chest 46.5–49.5 in, arm length 34.8 in
• XXXL: chest 49.5–53 in, arm length 35.3 in

Care

Machine wash at 40°C.

About this product

Who is it for

Men wanting a heavyweight merino base layer for cold-weather alpine sports, winter trekking and high-altitude activity.

When and where to use it

Suitable for cold conditions where a fitted, next-to-skin layer is worn under additional layers.

Common questions

• Suitable for beginners? Not stated