Kombi Proseries2 ladies thermal longjohns/base layer. 90% Polyester 10% Spandex. Comes in black. Mid-weight, level 2/4 of warmth. A little bit of spandex and a lot of polyester go a long way to keeping you warm, dry and comfortable in all your winter pursuits. The 3-level Proline system features progressive technology and built in air pockets to provide clean, permanent wicking and thermal retention. Of course, these are just fancy features that mean one simple thing-you'll be happy we've got you covered.