# Smartwool Men's Classic All-Season Merino Base Layer 1/4 Zip - Iron Heather

Smartwool's Men's Classic All-Season Merino Base Layer 1/4 Zip in **Iron Heather** is the do-it-all base layer for warm or cold weather. All-season-weight merino wool is wrapped around a recycled nylon core for extra durability, while keeping soft, breathable merino next to your skin. Naturally temperature-regulating and odor-resistant, with a slim, body-enhancing fit.

-   **All-Season Merino:** 88% merino wool wrapped around a recycled nylon core - soft next to skin, tougher on the outside
-   **Year-Round Comfort:** breathable warmth in the cold, cool comfort in the heat; naturally resists odor
-   **8 in Center-Front Zipper:** semi-locking slider for easy ventilation control on the move
-   **Flatlock + Offset Seams:** shoulder and side seams are positioned to minimize chafing, even under a pack
-   **Slim, Body-Enhancing Fit:** follows the contours of the body; side seams wrap forward for a flattering fit
-   **Colorway:** Iron Heather (D36)
-   **Material:** 88% Merino Wool, 12% Nylon. Machine wash.

## Details

- **Price:** 105.0 USD
- **Vendor:** Smartwool
- **Type:** Apparel
- **Tags:** Base Layer, done, Fix, Mens, Mens Apperal, Merino, Smartwool

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Iron Heather / Small | 105.00 USD | In stock |
| Iron Heather / Medium | 105.00 USD | In stock |
| Iron Heather / Large | 105.00 USD | In stock |
| Iron Heather / XL | 105.00 USD | In stock |
| Iron Heather / XXL | 105.00 USD | In stock |

## Images

- Smartwool Men's Classic All-Season Merino Base Layer 1/4 Zip in Iron Heather

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> Source: [The Shoe Collective](https://theshoecollective.com/products/smartwool-mens-classic-all-season-merino-base-layer-1-4-zip)
> Updated: 2026-10-12