With a design fit for any alpine fireside the Spyder Eiger Wool Mid Layer Top combines the warmth of merino wool with the performance of Sorona polyester The result is a blend that has exceptional warmth heavenly softness and moisture management to match any technical layer out there The full front zipper allows you to layer up with ease Merino wool and Sorona polyester blend for soft warm feel Breathable and moisture wicking for technical performance Full zip style for layering or wear as stand alone jacked.