From high intensity Sports Compression Base Layers that hold you tightly compressed to increase blood flow, increase muscle support to help improve your sporting performance and recovery, to Thermal Body Contoured non-compressive Base Layers that simply keep you warm or cool, the Base Layer is the critical component of your sporting dress code. 

In warm conditions, a quality Base Layer will aid moisture transport away from the skin where it evaporates quickly to help keep you cool and dry to improve your sporting performance.

In cold conditions, a Thermal Base Layer will regulate your body temperature and keep you warm and dry when the weather really closes in.  The only decision is which type of Base Layer do you need?