Mapei Ultralite Mortar is a lightweight, premium-grade, multipurpose thin-set mortar that also can be used for medium-bed and nonsag applications. It is formulated with Easy Glide Technology™ for ease of application and BioBlock™ technology for antimicrobial protection. Ultralite Mortar provides twice the coverage of a standard thin-set mortar. A Universal Color Formula™ product, Ultralite Mortar is approved for use with natural stone and light-colored grouts. Sold by th bag. Size: 25-lb.