Although soft and fleecy on the inside, the outside is rather shiny (a bit like Lycra). For a base layer this is handy, as other clothing slips over it quite easily. Snug fit, similar to a cyclist's racing jersey but without the pockets or extra length in the back. Plenty of length in the arms.
This a fantastic top - it insulates and breathes so you're warm or cool depending on the environment and your own body temperature. It's incredibly comfortable too - designed as a base layer but to be honest I'm more often found wearing it casuallly with a pair of jeans in my local!!!!!!