Merino-blend build
The 79% merino wool and 21% polyester blend balances merino feel with added durability and faster drying.
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Coreline AR Merino 270 Half-Zip Baselayer
In the field
A 270 gsm half-zip baselayer made from 79% merino wool and 21% polyester, with fine 17.5-micron merino fibers.
Venting and coverage
A half-zip vent, mock-neck collar, thumb loops, close fit, and longer back hem support cold-weather layering.
High-output details
Moisture-wicking, quick-dry, and odor-resistant performance is paired with reflective detail for low-light visibility.
Construction and materials
- Material
- 79% merino wool / 21% polyester
- Fabric weight
- 270 gsm, midweight
- Fiber fineness
- 17.5 microns
- Closure
- Half zip
- Collar
- Mock neck
- Fit
- Close to body
- Hem
- Longer back hem
- Sleeve details
- Long sleeves with thumb loops
- Reflective detail
- Reflective detailing
- Fabric features
- Moisture-wicking, quick-drying, odor-resistant and temperature-regulating
- Color options
- Black, Blue
- Size options
- S, M, L, XL, 2XL
Fit, options and reference notes
- Size chart scope
- Reference body chart XS–4XL; only selector choices are purchase options.Body measurements, not garment dimensions; sleeve measured from center back of neck to wrist
- Chart fit advice
- Between sizes, size up for a relaxed fit
Cold air. Hot engine. This midweight half-zip keeps the throttle open without cooking you out. Fine 17.5-micron merino blended with polyester for stronger wear and faster dry-down.
Key Features
-
Midweight 270 gsm knit for four-season layering
-
79% merino wool / 21% polyester blend: wool feel, added durability
-
Half-zip vent to dump heat on the climb
-
Mock-neck collar for seal-up warmth when the wind spikes
-
Moisture-wicking + quick-dry performance for high-output days
-
Odor resistance from merino’s natural properties
-
Thumb loops to lock sleeves in place under gloves and shells
-
Reflective detail for low-light visibility
-
Close-to-body fit + longer back hem for clean layering coverage
Recommended Use
Run it next-to-skin for ski days, cold runs, and long hikes where sweat is guaranteed. Zip up for ridge gusts, zip down when the pace turns savage. Add a shell and you’ve got a hard-charging system.
Bottom Line
Midweight merino blend. Half-zip control. Zero excuses.
Men's Tops — Size Chart (XS–4XL)
Measurements reflect body measures, not garment dimensions. If between sizes, size up for a relaxed fit.
| Size | Chest (in) | Chest (cm) | Waist (in) | Waist (cm) | Sleeve* (in) | Sleeve* (cm) |
|---|---|---|---|---|---|---|
| XS | 32–34 | 81–86 | 26–28 | 66–71 | 31–32 | 79–81 |
| S | 35–37 | 89–94 | 29–31 | 74–79 | 32–33 | 81–84 |
| M | 38–40 | 97–102 | 32–34 | 81–86 | 33–34 | 84–86 |
| L | 41–43 | 104–109 | 35–37 | 89–94 | 34–35 | 86–89 |
| XL | 44–46 | 112–117 | 38–40 | 97–102 | 35–36 | 89–91 |
| 2XL | 47–49 | 119–124 | 41–43 | 104–109 | 36–37 | 91–94 |
| 3XL | 50–53 | 127–135 | 44–47 | 112–119 | 37–38 | 94–97 |
| 4XL | 54–57 | 137–145 | 48–51 | 122–130 | 38–39 | 97–99 |
*Sleeve measured from center back of neck to wrist. 1 inch = 2.54 cm.
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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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