“I have Sorel Waterproof boots from 15 years ago that I need to replace the liners. these boots have pull cord at top and lace over foot. The liner says WOS 7. Have the sizing changed? Do I order 7 or 8? Will these be as warm as the plain felt? I love these boots and can not make it through winter without! Great products...”
I would suggest going with the 7 since that is what your current liners are labeled as.