Icebreaker
Icebreaker 125 Cool-Lite Sphere III Long Sleeve T-Shirt (men's, size M)
- Weight: 6/10 How much it adds to your pack.
- Warmth: 3/10 How much the fabric insulates next to your skin. Heavier fabric is warmer and slower to dry.
Warm-weather and high-effort walking and hiking where you want a light long-sleeve top for sun cover
- Weight
- 206 g (M)
- Fabric weight
- 125 g/m²
- Fibre
- Blend
- Merino
- 40%
Where to buy
Alpinetrek £59.16 In stock. Black, Lichen, Metro Heather and Midnight Navy Heather, size M in stock, all the same price. Free delivery from £85; the cost under £85 is not on the page.
View at shop: AlpinetrekIcebreaker £79.99 In stock. Free delivery. Metro Heather, size M in stock. Free standard shipping over £40; free returns.
View at shop: IcebreakerPrices checked 8 Nov 2026 on each shop's own page; shops can change them. We earn no commission on these links; shops are listed by price. More
Our ratings (out of 10)
1 to 10, compared with the whole market. Each says what it's based on. How we score
Weight
From maker's figures 6/10How much it adds to your pack. 6: A bit better than average.
206 g in men's size M (Icebreaker UK) is in the 200–239 g band.
Warmth
Estimate from maker's specs: fabric weight (g/m²) 3/10How much the fabric insulates next to your skin. Heavier fabric is warmer and slower to dry. 3: Below average. Fine for some trips, not others.
Estimate from maker's specs
In short
Good for
- Warm-weather and high-effort walking and hiking where you want a light long-sleeve top for sun cover
- A breathable summer layer: Icebreaker's Cool-Lite blend is made to keep you cool
- Layering under a shell on mild days; too light for cold weather on its own
Strengths
- 206 g in size M (Icebreaker's figure), in the 200–239 g band
- 60% TENCEL lyocell and 40% merino blend that Icebreaker designs to be breathable and quick drying
- Offset shoulder seams, drop tail hem and side splits at the hem for mobility
- Regular fit, to be worn alone or over another layer
Weaknesses
- Icebreaker describes the Cool-Lite blend as ideal in warmer conditions, so it is not a cold-weather layer
- Only 40% merino; the other 60% is TENCEL lyocell
- Icebreaker's care label: machine wash cold, no softener, no bleach, do not tumble dry, line dry in shade
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.
ShowHide sources (4)
- Icebreaker UK: Men's Merino Blend 125 Cool-Lite Sphere Long Sleeve T-Shirt: price £79.99, weight size M 206 g, 60% TENCEL lyocell / 40% merino
- Alpinetrek: Icebreaker Merino 125 Cool-Lite Sphere III L/S Tee (material thickness 150 g/m², price)
- Icebreaker: base layer guide (lightweight layers 75–175 g/m², midweight around 200 g/m², heavyweight 260 g/m² and above)
- Snowleader: Icebreaker Men Merino 125 Cool-Lite Sphere III LS Tee (60% Tencel, 40% merino wool, 150 g/m²)