You are using a web browser we don't support. Please use the latest version of one of these browsers.

Mozilla Firefox

Google Chrome

Apple Safari

Microsoft IE

Back to top

SmartWool NTS 250 Funnel Zip Long Underwear Top - Men's

Deep Sea Heather
Deep Sea Heather

This product is no longer available, but don't go just yet.


  • Made of soft, non-irritating merino wool, this top insulates, wicks away moisture and resists odors—naturally
  • Midweight NTS 250 fabric is ideal as a single layer in cold weather and a base layer for very cold weather
  • Deep 15.5 in. center front zip with semi-locking logo slider offers instant ventilation
  • High back neck and droptail hem provide additional coverage
  • Chest pocket on wearer's right ensure pockets don't stack up when layering
  • With a UPF 50+ rating, fabric provides excellent protection against harmful ultraviolet rays
  • Flatlock seams placed thoughtfully on shoulders and arms are designed to help eliminate chafing
  • Machine washable; tumble dry low


View all SmartWool Men's Long Underwear Tops

REI membership


Best Use Hiking
Shirt style Zip-front
Fabric Merino wool
Sun-protective fabric Yes
Moisture wicking Yes
Underwear weight Lightweight
Sleeve Length Long sleeve
Gender Men's

The REI Difference

100% satisfaction guaranteed

We stand behind everything we sell. If you are not satisfied with your REI purchase, you can return it for a replacement or refund within one year of purchase.

REI's guarantee doesn't cover ordinary wear and tear or damage caused by improper use or accidents.

If your item has a manufacturing defect in its materials or workmanship, you can return it at any time. See our limited warranty.

Gear & advice you can trust

At REI, we live and breathe the outdoors, and we're passionate about sharing our expertise with people of all skill levels. Whether you're new to the outdoors or a seasoned explorer, we'll take the time to understand your needs and help you find the right gear for you.

10% annual member refund

Anyone can shop at REI, but for a one-time $20 fee you can become an REI member and enjoy a lifetime of benefits. These include an annual member refund, typically 10% back on eligible purchases.*




*10% is typical but not guaranteed. Your refund is based on eligible purchases, which exclude REI gift cards, services, fees, REI Adventures trips,, and discounted items. Learn more