Smartwool Active Ultralite Short Sleeve Tee

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UOG TOP PICK – For Lightweight Comfort in the Heat: With a breathable Merino-TENCEL blend, quick-drying performance, and odour resistance, the Smartwool Active Ultralite Short Sleeve Tee is a top choice for multi-day hikes and high-output days in warm conditions.

Smartwool says: 

Simple but practical, our Men’s Active Ultralite Short Sleeve tee is soft yet functional, for all-day comfort and utility. Its super-light performance fabric—a blend of ZQ-certified Merino wool with TENCEL™ Lyocell fibers—this performance fabric will help keep you cool when your intensity amps up, and its design helps minimize chafing. Plus, it’s odor-resistant, breathable, and temperature-regulating, all helpful features when you work up a sweat. With a body-hugging athletic fit, this tee will keep you looking and feeling good, whether you’re pumping iron at the gym or hitting the trail for a hike.

Our Verdict

Soft, breathable and fast drying, this is one of the easiest tees to wear for warm-weather movement.

The Smartwool Active Ultralite Short Sleeve Tee weighs 119g in Medium and uses a Merino-TENCEL blend that feels natural but dries faster than standard Merino. I really value that mix—it balances next-to-skin comfort with better moisture handling, especially during higher-output efforts. It’s also odour-resistant, which makes it ideal for multi-day use.

The fit is relaxed rather than close, so if you prefer a more performance-oriented cut, consider going down a size. The stitching is clean and sits flat, and the island doesn’t irritate under a pack. The fabric isn’t the toughest I’ve used, but for a base layer that’s this breathable and comfortable, that’s a trade-off I’m happy with.

This is my go-to baselayer, especially for multiday hiking. I own three. 

– Reviewed by Ultralight Outdoor Gear

Features

• Our athletic fit is intended to be body-skimming to keep the body moving freely
• Ultralite fabric combines the moisture management, temperature regulation, and odor resistance of Merino with  TENCEL™ Lyocell fiber
• Odor-resistant
• Offset shoulder and side seams help increase comfort and minimize chafing
• Reflective elements

Specifications

• Small weighs: 111g
• Medium  weighs: 119g
• Large weighs: 126g
• XLarge weighs: 139g
• Fit: Athletic

Material & Construction

• 53% Merino Wool, 47% Lyocell. Exclusive Of Decoration.

Help & advice:

• The Benefits of Merino Wool