Paulson's 510-EB structural goggle uses a buckle system and passes the test for withstanding 500° for five minutes. This item meets NFPA 1971, 1977, 1951, & ANSI Z87.1 Specifications.
Paulson's site has more structural goggle options : http://www.paulsonmfg.com/fire/A-TAC-Firefighter-Structural-Goggles