Carhartt's flame-resistant duck bib overall is unlined for comfort in warmer weather. Made of 13-ounce, flame-resistant 100% cotton duck, it features high back with flame-resistant elastic suspenders and high temperature nylon center-release buckles. It also has a chap-style double front for durability, multiple tool and utility pockets, hammer loop, ankle-to-mid-thigh brass leg zippers with nomex zipper tape, flame-resistant melamine button at waist and protective flaps and arc-resistant snap closures. Nfpa 70e compliant. br>br>read more about carhartt's a href=http://www.carhartt.com/webapp/wcs/stores/servlet/frmainview?langid=-1ands toreid=10051andcatalogid=10101anddescppc=personalprotectiveclothinga href= /a> flame-resistant line. 13-ounce, heavyweight, flame-resistant 100% cotton duck unlined nfpa 70e compliant a href=http://www.carhartt.com/webapp/wcs/stores/servlet/frmainview?langid=-1ands toreid=10051andcatalogid=10101anddescppc=personalprotectiveclothinga href= /a> click here for technical information