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#1 on this list
Men's Classic Thermal Merino Base Layer 1/4 Zip
Smartwool
Best overall for cold-weather layering.
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#2 on this list
ULTRA Merino 145 Zip-T — Half Zip
KUIU
Best lightweight hunting option with breathable side panels.
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Specs side by side
| Spec | Men's Classic Thermal Merino Base Layer 1/4 Zip | ULTRA Merino 145 Zip-T — Half Zip |
|---|---|---|
| Material | 100% Merino Wool, exclusive of decoration, 250 gsm | Body: 90% Merino Wool / 10% Nylon; side panels: 83% Merino Wool / 17% Nylon, 145 gsm |
| Price | $130 (maker, Nov 10 2026) | $109 (maker, Nov 10 2026) |
| Zip | Quarter-zip | Half-zip (not a true quarter-zip) |
| Weight | — | 8 oz / 227 g (L) |
What our reviewers liked and didn't
Men's Classic Thermal Merino Base Layer 1/4 Zip
- 100% merino
- Offset seams
- 10-inch ventilation zip
- Warm for high-output summer use
ULTRA Merino 145 Zip-T — Half Zip
- 145 gsm construction
- Eyelet side panels
- UPF 50+ rating
- Half-zip, not quarter-zip
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