How to Choose Base Layers

An all-season favorite, the men's Smartwool Classic All Season Merino long-sleeve base layer top can be sported as a base layer for fall-weather activities or worn on its own for summer backpacking.
Imported.
View the Smartwool Classic All Season Product LineView all Smartwool Men's Base Layer Tops| Best Use | Multisport |
|---|---|
| Shirt Type | T-shirt |
| Fabric | 77% merino wool/23% nylon |
| Underwear Weight | Lightweight |
| Sleeve Length | Long Sleeve |
| Gender | Men's |
| S | M | L | XL | XXL | |
|---|---|---|---|---|---|
| Chest | 36 - 38 | 39 - 41 | 42 - 44 | 45 - 48 | 49 - 51 |
| Sleeve Length | 31 - 32 | 32 - 33 | 33 - 34 | 34 - 35 | 35 - 36 |
| Waist | 29 - 31 | 32 - 34 | 34 - 37 | 38 - 40 | 41 - 44 |
| Hip | 36 - 38 | 39 - 41 | 42 - 44 | 45 - 48 | 49 - 51 |
| Inseam | 30 - 31 | 31 - 32 | 32 - 33 | 33 - 34 | 34 - 35 |
Measurements are stated in inches.
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My new favorite wool layer. It has been incredibly cold so I'm using it almost al the time. I also like the tied dye.
XL is a great slim fit at 6'6" 215 lbs. This smartwool works for a wide range of temperatures.
Super soft and lightweight wool base layer. Would definitely buy again.
Nice light shirt for layering.