Pure merino knit
The fabric is 100% merino wool with no blend fibers.
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Coreline AR Men’s Merino Baselayer Bottom
In the field
These lightweight next-to-skin bottoms use 100% merino wool with a quick-drying, moisture-wicking knit and flat low-bulk seams.
Moisture and odor management
The lightweight knit wicks moisture, dries quickly, breathes, and naturally resists odor.
Low-bulk fit
A next-to-skin athletic fit and flat seams reduce bulk under pants and shells.
Materials and performance
- Material
- 100% merino wool
- Weight class
- Lightweight knit
- Moisture management
- Moisture-wicking fibers
- Drying
- Quick-drying
- Odor resistance
- Natural odor resistance
Fit and construction
- Fit
- Next-to-skin athletic fit
- Seams
- Flat, low-bulk seams
- Pants length
- Long
Size chart notes
- Chart scope
- Reference chart covers XS–4XL; purchasable sizes remain the current variant-selector options.
- Chart note 1
- Measurements reflect body measures, not garment dimensions.
- Chart note 2
- Inseam shown is a regular length (32 in / 81 cm).
- Chart note 3
- Tall/short variations may be available on select styles.
- Chart note 4
- Inseam is measured crotch to ankle.
- Chart note 5
- For tall (34 in / 86 cm) or short (30 in / 76 cm) lengths, adjust accordingly.
- Chart note 6
- 1 inch = 2.54 cm.
Men's Bottoms — Standard Size Chart (XS–4XL)
- Size XS
- waist 26–28 in (66–71 cm), hip 32–34 in (81–86 cm), inseam 32 in (81 cm)
- Size S
- waist 29–31 in (74–79 cm), hip 35–37 in (89–94 cm), inseam 32 in (81 cm)
- Size M
- waist 32–34 in (81–86 cm), hip 38–40 in (97–102 cm), inseam 32 in (81 cm)
- Size L
- waist 35–37 in (89–94 cm), hip 41–43 in (104–109 cm), inseam 32 in (81 cm)
- Size XL
- waist 38–40 in (97–102 cm), hip 44–46 in (112–117 cm), inseam 32 in (81 cm)
- Size 2XL
- waist 41–43 in (104–109 cm), hip 47–49 in (119–124 cm), inseam 32 in (81 cm)
- Size 3XL
- waist 44–47 in (112–119 cm), hip 50–53 in (127–135 cm), inseam 32 in (81 cm)
- Size 4XL
- waist 48–51 in (122–130 cm), hip 54–57 in (137–145 cm), inseam 32 in (81 cm)
Pure merino. Zero nonsense. The Coreline AR Baselayer Bottom is built for next-to-skin performance when temps swing and output stays high. Thin knit. Fast dry. Odor doesn’t stand a chance.
This is your first layer. It sets the tone for the entire kit.
Key Features
-
100% merino wool construction—no blends, no fillers
-
Lightweight knit for high breathability and four-season range
-
Natural odor resistance for multi-day use
-
Moisture-wicking fibers move sweat fast
-
Quick-drying for stop-start output
-
Next-to-skin athletic fit for clean layering
-
Flat, low-bulk seams reduce friction under shells and pants
Men's Bottoms — Standard Size Chart (XS–4XL)
Measurements reflect body measures, not garment dimensions. Inseam shown is a regular length (32 in / 81 cm). Tall/short variations may be available on select styles.
| Size | Waist (in) | Waist (cm) | Hip (in) | Hip (cm) | Inseam (in) | Inseam (cm) |
|---|---|---|---|---|---|---|
| XS | 26–28 | 66–71 | 32–34 | 81–86 | 32 | 81 |
| S | 29–31 | 74–79 | 35–37 | 89–94 | 32 | 81 |
| M | 32–34 | 81–86 | 38–40 | 97–102 | 32 | 81 |
| L | 35–37 | 89–94 | 41–43 | 104–109 | 32 | 81 |
| XL | 38–40 | 97–102 | 44–46 | 112–117 | 32 | 81 |
| 2XL | 41–43 | 104–109 | 47–49 | 119–124 | 32 | 81 |
| 3XL | 44–47 | 112–119 | 50–53 | 127–135 | 32 | 81 |
| 4XL | 48–51 | 122–130 | 54–57 | 137–145 | 32 | 81 |
Inseam is measured crotch to ankle. For tall (34 in / 86 cm) or short (30 in / 76 cm) lengths, adjust accordingly. 1 inch = 2.54 cm.
Recommended Use
Pull these on for cold mornings, long days, and variable output—ski laps, cold hikes, camp setup, or work outside when weather doesn’t quit. Built to run solo or stack under softshells and hardshells without bunching.
They shine when you’re moving, sweating, stopping, then moving again.
Bottom Line
Lightweight merino that works as hard as you do—day after day.
Recommended for You
FAQ
How can I reach Alpine Extreme if I have questions?
Email [email protected] or use our contact form.
Do you offer free shipping?
Free standard shipping is available to most addresses worldwide. Availability, delivery estimates, and any expedited charges depend on the destination and order. International duties, tariffs, and customs fees remain the customer’s responsibility. See our Shipping Policy for details.
What's the return policy at Alpine Extreme?
Eligible return or exchange requests must be submitted within 45 days of the order date. Items must be new and unused with original packaging, tags, and accessories. General change-of-mind returns are not accepted. Return-shipping responsibility depends on the reason for the return. See the full Return & Refund Policy for exclusions and refund timing.
How long will it take for my order to arrive?
Orders are typically processed within 2–5 business days. Most standard shipments arrive within 7–14 business days after shipping, depending on destination and carrier conditions. Delivery estimates are not guaranteed.
Can I track my order?
Yes. Tracking details are emailed after shipment. You can also check order status with your order information through our order-tracking page.
What if there's an issue with my order?
Email [email protected] or submit the form on our support page. Report delivery issues within 60 days of the order date so carrier information is still available.
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