There's a reason that Icebreaker's Bodyfit 260 Long Sleeve is a best-selling classic year after year. The 200 weight 100% Pure Merino is light enough to be worn alone on long haul runs or during fluid full day climbing ascents. But it's equally adept as a heavier baselayer in colder conditions. With a close to body fit, the Icebreaker Bodyfit 260 Crew is a long sleeve dream shirt for any man.

The Icebreaker Men's Tech Top longsleeve is a 1/4 zip neck, 260 weight Merino wool pullover designed with the active user in mind. Wear it as a warm base layer or use it for cold morning runs. The Men's Tech Top features a drop-tail hem in back, 2 thumbloops and fits close to the body.

Weather deteriorating fast and the pitch ahead looking dubious? You can at least take solace in the warmth of this zip-neck.

A rugged fleece with chiseled good looks, Patagonia's Better Sweater 1/4-Zip Fleece Pullover for Men works well under a shell on the mountain and impresses the in-laws at dinner. Low in bulk and high in warmth and charm, the Better Sweater 1/4-Zip aims to please with its soft fleece interior and moisture wicking attributes that make it at home inside or outside.

The Icebreaker Men's 260 Crewe is a great do-everything piece. Featuring all the best properties of Merino Wool, the Men's 260 Crewe is odor resistant, fast drying and has a great next-to-skin feel - that's right NO ITCH. A close fit and non-chaffing flatlock stiching make this a great winter travel piece. Fits close to the body.

The ExOfficio Dryfly Flex Men's Long Sleeve Shirt is a shirt with stretch. Designed to provide maximum mobility when your wetting a line or running to catch a train.

With a close to the body fit, the Oasis Crew from Icebreaker should be one of the elemental baselayers in any active outdoorsman's clothing drawer. Resistant to odor and excellent breathability make Icebreaker's Oasis Crew Long Sleeve Shirt versatile--worn alone or as part of an active layering system. Features include gusseted underarms, flatlock stitching, and forward side seams to avoid chafing under pack straps.

The ExOfficio Trip'r Check Men's Long Sleeve Shirt provides maximum comfort in hot climates or during times of elevated activity.

Icebreaker's Oasis Crew is an ideal long sleeve baselayer that fits well under any shell or mid layer. With close athletic fit, this is an ideal top that breathes extraordinarily well and wicks moisture, too. Whether it's a warm, dry climate or cold and clammy you can expect only the best performance from the Oasis Crew.