400 sq. ft. 3mm 3-in-1 underlayment. Thermal/acoustic foam with self-sealing edges for flooring.

Acoustic, quiet, and comfortable while walking or standing on your floor Help your feet to feel warm in winter and comfortable in summer Advanced thermal insulation Premium Vapor Barrier provides better water and moisture protection Premium cell design -- stronger cell wall for stronger product Better sound dampening Self-sealing Lip N Tape system Pre-attached tape (end to end) and 3" overlap makes installation easy 3 mm overall thickness; 400 sq.ft. per package