All products on FSAstore.com, the Flexible Spending Account Site, are guaranteed to be FSA Eligible! White, Extra Absorbency The NU-Fit brief features First Quality’s Advanced Zoning System for leakage protection and skin dryness. They feature Easy-Lock Fastener (ELF) , reattaching fasteners that securely grip and hold anywhere on the brief, reattaching over and over again without being sticky. Cloth-like, outer fabric. Easy-Lock Fastener (ELF) . Advanced Zoning System with targeted acquisition zone and fecal containment zone. Refasten zone. Enhanced, breathable zones.