Under ArmourMen's Heatgear Armour SL Compression T-shirt (pack of 1)

Far too small to the point where my son struggled to get it back off

I bought a Small, and this is way below Small, perhaps Extra Small.

I use it for cycling to work so I’m not all sweaty when I arrive due to it absorbing my sweat and it brings my tummy in. Multi tasking.

It's a nice top for gym, comfortable when on but it rides up a little and also a nightmare to get on and off!

Fitted like a glove. Got the same as the previous 2 and they work well for cycling in to work and keeping the sided a bit tighter. Very happy.