Lululemon Men 5 Year Basic V Neck Tee Everyday T Shirt Stretch H. Charcoal 

Missing the labels but this looks like a Medium depending on how fitted you like it, check the measurements with your own shirts. 

Fabric is stretchy

Sz M ?

Pit to Pit: 20" Length from back neck seam to hem: 29" Very Good Pre-Owned Condition shows normal wash and wear condition I think this is a Cotton/Lyosell/Elastane blend Fabric is soft and comfortable see photos Thanks!