Baselayer - Long Sleeves

Breathable, featherlight, and built for movement in the height of summer. Montbell says: Made of the lightest knit t-shirt fabric in Montbell's lineup and designed for intense workouts, high-output days on the trail, or activities during the hottest.…

We're working out what we think - we'll add our view here!  Patagonia says:  Our most versatile technical top is built for use on the trail or on the water: It’s quick drying, has stretch for mobility and comfort, plus HeiQ® Mint …

A staple in Montane's iconic Dart range, this long-sleeved T-shirt continues to deliver reliable performance and comfort for year-round mountain adventures. Montane says:  The Dart Long Sleeve T-Shirt is a classic, all-season, all-mountain techn…

Lightweight, long-sleeved top for hiking and outdoor life in warm, sunny climates. Produced without PFCs, made for a lifetime of use. Fjallraven says:  Lightweight, functional long-sleeved top for men that is suitable for outdoor life and...

We're working out what we think - we'll add our view here!  Patagonia says:  An all-around tech tee made to wick moisture and stretch as you move, with silky fabric that feels cool even when the air is hot. With HeiQ® Mint odor control …

We're working out what we think - we'll add our view here!  Patagonia says:  Our most versatile technical top is designed for use on the trail or on the water: It’s quick drying, has stretch for mobility and comfort, and HeiQ® Min…

This technical tee has been designed to be an all-rounder. The soft, comfortable feel is backed up with high wicking, breathable qualities to give you a versatile top. Berghaus says Simple, classic t-shirts are always the best. Comfortable and elega…

We're working out what we think - we'll add our view here!  Patagonia says:  Artist Vernan Kee created our Cloud Crag graphic, which shows the Fitz Roy massif from the clouds. We screen-printed the artwork on our Men's Long-Sleeved...

We're working out what we think - we'll add our view here!  Patagonia says:  Our most sun-protective tech tee offers 40+ UPF coverage with wicking and fast-drying performance. Single-knit construction generates a naturally sun-protective ef…

The Alpenglow is a technical fitting base layer that offers comfortable fit and protection from overheating with the BD.cool technology, making it perfect for climbing and other high activity sports.  Black Diamond says:  A technical fit pa…

The perfect blend of natural and synthetic fibres that includes all of the positives and non of the negatives from each.  Fjällräven says: Lightweight, long-sleeved top in a soft jersey knit made from merino wool and recycled polyeste…

The OMM Bearing Tee LS is a long sleeved, full coverage technical baselayer that is high wicking with UV protection. Great for training and every day use due to the high stretch and comfort. OMM says: The long sleeve Bearing tee uses our 4 way coolp…

The Mammut Tree Wool FL Longsleeve blends merino wool and Lyocell for comfort, warmth, and breathability. It's lightweight at 176 grams (medium), dries faster than traditional wool, and has temperature regulation and odor-neutralizing properties. Mam…

The Mountain Equipment Redline LS Tee offers lightweight durability, moisture-wicking, and quick-drying capabilities that are ideal for layering. Mountain Equipment says:  This comfortable long sleeved tee can be worn alone on south facing rock.…

A merino long sleeve that balances insulation with breathability for winter layering. Fjallraven says:  Light, soft and warm long-sleeved base-layer top made from 100% traceable merino wool. Produced without PFAS. Stay in tune with nature in thi…

UOG TOP PICK: Top Pick for Versatility: The Black Diamond Alpenglow Pro Hoody combines exceptional sun protection, durable weather resistance, and thoughtful features, making it an essential, year-round layer for multi-day adventures. Black Diamond..…