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#4 on this list
Classic Thermal Merino 250
Smartwool
The best-cut 250-weight in the US, with a body-mapped fit that never rides up.
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#5 on this list
230 Competition
Ortovox
Austrian Merino with mesh panels where you overheat. Best for hard uphill in cold air.
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Specs side by side
| Spec | Classic Thermal Merino 250 | 230 Competition |
|---|---|---|
| Maker | Smartwool | — |
| Material | 100% Merino Wool | 80% Merino Wool, 20% Polyamide |
| Fabric Weight | 250 g/m² | — |
| Fit | Slim, body-mapped | Athletic, form-fitting |
| Best For | Cold weather layering, skiing, hiking | — |
| Weight | — | 230 g/m² (main fabric) |
| Construction | — | Body-mapped knit |
| Odor Resistance | — | High |
| Origin | — | Austria (wool) |
What our reviewers liked and didn't
Classic Thermal Merino 250
- Excellent thermal regulation and breathability across varied activity levels
- Superior odor resistance for multi-day wear
- Thoughtful, body-mapped fit that doesn't ride up or restrict movement
- Soft next-to-skin feel, no itch
- Good balance of warmth for its moderate weight
- Higher price point compared to synthetic options
- Slower drying time than pure synthetics when soaked
230 Competition
- Exceptional temperature regulation via body-mapping
- Highly breathable, prevents overheating during exertion
- Excellent odor resistance, suitable for multi-day use
- Comfortable, non-chafing seamless construction
- Good balance of warmth, durability, and stretch
- Premium price point may be prohibitive for some
- Requires careful washing to maintain integrity
- Snug fit may not appeal to all users
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