Heatwave® Pack of 2 Men's Thermal T Shirt, Warm Underwear Baselayer, S M L XL XXL Thermals

Can anyone shed light on where these products are made?

Is this suitable to wear under dress/office shirts?

What size is XXL

Can anyone tell me if these vests are long enough for my husband who is 6' 2" tall. Other vests are too short in length. Thanks