The ProLite Plus mattress from Therm-a-Rest is an excellent 4-season backcountry sleeping pad solution. With its patent-pending diagonal-cut foams that assist in reducing convective heat loss, this boost insulative R-value making the women's ProLite Plus a warm, yet lightweight solution cold weather camping and ski touring. Built a little shorter than the regular ProLite Plus, this female-specific model provides added warmth for cold sleepers.