Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip

Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip

Stay warm and comfortable through your cold-weather adventures with the Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip. Designed for skiing, snowboarding, hiking, and winter travel, this men's thermal base layer combines natural merino wool performance with a comfortable, streamlined fit. Whether you're layering up for a day on the mountain or exploring the outdoors in colder temperatures, this versatile quarter-zip provides dependable warmth and breathable comfort.

Made from 100% responsibly sourced ZQ Merino wool, the Classic Thermal Base Layer features a midweight 250 g/m² interlock knit that naturally regulates body temperature, manages moisture, and resists odors. The soft merino wool fabric helps maintain comfort during changing activity levels, making it an excellent foundation for cold-weather layering. Its slim fit follows the contours of the body, allowing it to fit comfortably underneath fleece jackets, insulated layers, and waterproof ski shells.

Designed with movement in mind, this Smartwool base layer features flatlock seams and offset shoulder and side seams to help minimize chafing during extended wear. The quarter-zip neckline provides adjustable ventilation when temperatures rise, while the updated fit enhances comfort and functionality. From early-morning hikes to long days on the slopes, this premium merino wool base layer delivers natural performance and lasting comfort.

Features:

• Men's midweight merino wool thermal base layer

• 100% ZQ Merino wool construction

• Natural temperature regulation for cold-weather comfort

• Moisture-managing fabric helps keep you comfortable

• Naturally odor-resistant merino wool

• Soft interlock knit construction

• 250 g/m² midweight fabric

• Slim fit designed to follow the body's contours

• Quarter-zip neckline for adjustable ventilation

• 10-inch center-front zipper on size Medium

• Flatlock seam construction helps minimize chafing

• Offset shoulder and side seams for enhanced comfort

• Side seams wrap toward the front

• Updated fit for improved functionality

• Ideal for skiing, snowboarding, hiking, winter travel, and cold-weather layering

Materials:

• 100% Merino Wool

• Wool Standard: ZQ Merino

• Fabric Construction: Interlock Knit

• Fabric Weight: 250 g/m²

• Fabric Properties: Moisture Management, Temperature Regulation, and Natural Odor Resistance

Fit & Specifications:

• Brand: Smartwool

• Style: Classic Thermal Merino Base Layer 1/4 Zip

• Manufacturer Style Number: SW002821

• Gender: Men's

• Product Type: Thermal Base Layer Top

• Fit: Slim

• Sleeve Length: Long Sleeve

• Neckline: Quarter Zip

• Center-Front Zipper: 10 inches (25 cm) on Size Medium

• Fabric Weight: Midweight, 250 g/m²

• Construction: Flatlock Seams with Offset Shoulder and Side Seams

• Country of Origin: Vietnam

• Recommended Uses: Skiing, Snowboarding, Hiking, Winter Camping, and Cold-Weather Layering

Care Instructions:

• Machine wash warm on gentle cycle

• Wash with like colors

• Do not bleach

• Tumble dry low

• Cool iron as needed

• Do not iron decoration

• Do not dry clean

About Smartwool

Smartwool creates premium merino wool apparel and accessories designed to help outdoor enthusiasts stay comfortable in changing conditions. Known for natural performance, innovative construction, and dependable comfort, Smartwool makes versatile base layers, socks, and outdoor essentials for skiing, hiking, travel, and everyday adventures.

Returns and Replacements
We want you to be completely happy with your order from The Backpacker, so we offer no hassle returns. If for any reason you are not satisfied with your order, we will gladly accept your timely return of unworn or unwashed items. Used merchandise cannot be returned. Items must be in the same condition as when it was received and should include the vendor packaging and tags. Unwanted merchandise must be returned within 30 days of receipt. Please allow 10-14 days for processing of the return. We will not reimburse for expedited shipping costs.

FINAL SALE ITEMS: Any items discounted more than 30% are deemed final sale and cannot be returned.

SEASONAL ITEMS: Due to shortened seasonal demand, items in the categories below have a 14 day return window

Winter Jackets

Snow Pants

Snow Bibs

Snow Suits

Base Layers

Snow Hats

Gloves and Mittens

Helmets and Goggles

Remember to:

1) Include your packing slip with reason for the return

2) Select whether you want a refund, store credit, or exchange

3) Check your email for confirmation of the refund/credit/or shipping of the exchange.

Exceptions may be made on a case by case basis by the customer service manager. To ask about a return or exception please reach out to customerservice@backpackeroutdoors.com

If my order does not fit as expected or I change my mind, can I return it for free?

Absolutely! If you find that your order does not match the description or you simply change your mind, you can return your order for free using the UPS return label or in-store up to 100 days after you’ve received your product. 

Can I return or exchange gently worn/used items?

No. Items can only be returned in the following condition:

• Unworn 
• Unwashed
• Same condition as purchased
• In original packaging 
• With all original vendor tags 

This includes defective merchandise.

Used merchandise can not be returned without written approval from a team member of The Backpacker. 

What should I do in the event of a broken product?

If you receive a product that is defective or in an undesirable condition, please return the item within 100 days and let us know whether you would like an exchange or refund. Please notify us in advance so we will know to anticipate the item if it doesn't reach us within the 100 day limit.  

How do I return my web order?

• Repackage your items including your packing slip with the reason for the return.
• Select whether you want a refund, store credit, or exchange.
• Attach the provided return label to the outside of your package.
• Drop off your item(s) at your local freight delivery access point (UPS store).
• If you did not receive a return label with your order or you need a replacement, email us ar customerservice@backpackeroutdoors.com or message using our Live Chat option available from 8:30am-4pm (cst).
• Check your email for confirmation of the refund / credit / shipping of the exchange.
• Web orders returned to our retail stores outside of Web Team business hours, Monday through Friday 9am - 4pm CST, will be processed on the next business day.

How long does it take for returns to be processed?

Please allow up to 10-14 business days for returns to be processed.