REI's 'Most Versatile' Base Layer Shirts That Are 'Super Lightweight' and 'Comfortable' Are Now Just $30

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Fall is the best time for outdoor activities as the cooler temperatures make running, biking, hiking, and camping much more enjoyable than the sweaty summer. But if your gear kit needs a refresh before heading outside, you might be in luck: Retailers like Dick's Sporting Goods, Amazon, and even Columbia are already sporting seasonal sales on use-now gear like tents, sleeping bags, and puffer jackets. REI is the one-stop shop for adventure deals, though, and one of the best discounts on the site is on its Co-op brand's half-zip base layer that's $15 off and selling like crazy.

REI Co-op's Lightweight Base Layer Half-Zip Top is on sale for just $30, which is 33% off of the normal price of $45. These soft polyester base layers have earned 85 five-star ratings (and climbing) from shoppers who say they're “well-fitting” and “attractive” with a “comfortable feel.” They're available in all sizes from small to 3XL and are mostly fully in stock in the four available colors. REI Co-op also has a crew-neck version that's on sale for a few dollars less.

REI Lightweight Base Layer Half-Zip Top in Spruce Heather, $30 (was $45) at REI

Wearing a comfortable base layer is the key to staying warm and comfortable outside when engaging in strenuous activities. This one from REI Co-op is made from a blend of materials like polyester and spandex, so it has a soft feeling, offers flexible four-way stretch, and also helps regulate body temp by wicking moisture. Comfort is enhanced by the flat seam stitching that eliminates chafing when wearing a backpack, and the back hem is extra long so it'll stay tucked in while getting active outside. It’s also rated UPF 50+ for sun protection, so you can bet it'll keep harsh rays away.

Satisfied shoppers liked the fit of the thin base layer the most. One shopper said that it's “super lightweight with an athletic, non-boxy fit over a T-shirt,” while another noted that the “fit is great and they're a good length for people averaging around 6 feet tall.” One customer also thought the shirt was “attractive” and felt nice on the skin, noting that it was “smooth and pleasing to the touch."

REI Lightweight Base Layer Half-Zip Top in Blue Nights Heather, $30 (was $45) at REI

Other shoppers liked that the lightweight base layer was able to be worn in many different situations. “I have three of them," a shopper began. "They are, far and away, the most versatile quarter-zip I own.” Another kept the compliments coming, saying “I’ve bought many REI base layers over the years, but these are absolutely the best.”

Making sure you have a good range of layers is the best way to comfortably tackle cold weather, and this base layer is a great place to start if you don’t already have one. It’s soft, lightweight, warm, and offers sun protection, plus, it’s only $30 (and available in multiple colors). Make sure to get one in your cart ASAP, though, because they're likely to sell out fast.