Undershirts

Under Armour Men's Metal Heatgear Sleeveless Tee
Brand: Under Armour

T3K Men's Thermal 3000
Brand: T3K

Easton Men's Eastech Performance Mock Tee
Brand: Easton

Under Armour Heat Gear Full Tee - Large - Brown
Brand: Under Armour
For extremely warm weather, the ideal base layer starts here: The HeatGearTM Full T. You'll never wear a regular T-shirt again.

Under Armour Loose Gear Full Tee - Xx-Large - Camo
Brand: Under Armour
Generous cut t-shirts drape the body like you are wearing nothing at all

Zimmerli Pure Silk Long Sleeve T-Shirt (8028136)
Brand: Zimmerli
100% silk

Champion Sport Stretch Muscle T-Shirt (Uc34)
Brand: Champion
95% Cotton, 5% Spandex

Calvin Klein Tonal Logo Short-Sleeve Crew Tee
Brand: Calvin Klein
Cotton

T3K Men's Thermal 3000
Brand: T3K

Under Armour Loose Gear Long Sleeve - X-Large - Green
Brand: Under Armour
The longsleeve alternative, Loose Gears perfect combination of performance and comfort.