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Breathable Mesh Fabric | Lightweight Warmth | Moisture Wicking
What makes this base layer incredible?
- Lightweight mesh fabric that breathes, wicks moisture and dries fast
- Balances warmth and ventilation for shoulder season conditions or high exertion winter activities
- Slim fit layers easily under mid layers or shells
- Soft, stretchy feel for unrestricted movement
Risk-free try-on at home.
If you ever damage any of your apparel, we'll repair it for free, for life.

Built for the in-between.
When the weather cannot make up its mind, the Shoulder Season Base Layer Top steps in. Made from the same lightweight, ultra breathable mesh fabric as our Egg Cradle Boxer Briefs, it delivers warmth without overheating and dries almost as fast as you can work up a sweat.
A slim fit makes it easy to slide under a mid layer or shell, while the soft, stretchy fabric moves naturally with your body. Breathable and moisture wicking, it keeps you comfortable through cool morning runs, brisk hikes, high excretion winter activities and unpredictable travel days.
It pairs perfectly with the Shoulder Season Base Layer Bottoms for a complete system built for unpredictable shoulder season conditions or full on winter blizzards. Quick drying, breathable, and versatile, this is the layer you will reach for when the forecast says “maybe.”
Features & Specs
- Best For: Shoulder season runs, hiking, travel, and layering for high exertion winter activities
- Fabric: Lightweight mesh fabric for breathable comfort and quick moisture management
- Fit: Slim cut layers easily under mid layers or shells
- Performance: Regulates temperature for comfort across changing conditions
- Comfort: Soft, stretchy feel for unrestricted movement
- Pairing: Designed to complement the Shoulder Season Base Layer Bottoms
Fabric Details
- Fabric: 78% Nylon (Softcool), 12% Nylon, 10% Spandex
- Weight: 146g (size M)
- Fabric weight: 130gsm
Shipping / Returns
- Fast & free shipping on all US orders.
- Free returns/exchanges on all products. We just ask that the product is still new & unwashed :)
- U.S. expedited delivery cutoff is 12PM PST. Orders placed after 12PM PST will ship the following business day.
- Free international shipping on orders over $100.
- For more information regarding shipping, returns, or exchanges, please click here to visit our Shipping & Returns page.


The KETL Commitment
Everything we make is guaranteed to be amazing & last a lifetime. We stand behind our craftsmanship with a lifetime warranty & offer a thorough repair / replace program. Visit our Warranty / Repairs page for more information on our commitment to excellence.
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