Change can be a good thing. Smartwool has improved the fit on their 100% Merino bottoms with new side seams and a curved seam in the back to help provide a slimming effect while reducing sag and excess fabric. Smartwool Women's Classic Thermal Merino Base Layer Bottoms are designed to keep you doing what you love while staying comfortable-helping keep your body temperature regulated and wrapping you in unbelievable Merino wool softness.