This ultra-soft microfiber thermal set is lightly fleece lined for added warmth and thermal insulation. Breathable and moisture wicking High warmth-to-weight ratio They will do a great job to keep you warm in the cooler months. Made from Ultra-Soft polyester and spandex, the four-way stretch material provides a comfortable fit. It is also lightly fleece lined for added warmth and thermal insulation. The moisture wick material will keep you dry and warm all winter long. Sizes are smaller than the conventional brands from the department store, we recommend going at least one size up.