This man's base layer tee is made from Ultrafine merino.  Ultrafine garments use 17.5 micron New Zealand Superfine Merino. They are warm, breathable, comfortable and can be worn for extended periods.  They are also unbelievably lightweight.  Crew neck to stop the wind.  One of the most insulating, lightestweight base layers you are likely to find.

Other Detail
Crew neck
Short sleeves
Garment Weight: 140 grams
Fabric: 100% New Zealand Ultrafine Merino

Sizes
Men's S, M, L, XL, XXL

Colours
black, grass (moss) green (pictured), navy, toetoe (offwhite)

Please note that the 'moss' green is more 'grass' than moss!