A face seal (12) for a respirator mask (10) includes an integrated strap (14) with a buckle (16). The integrated strap (14) is overmolded onto the buckle (16) to secure the buckle (16) to, and at least partially within, the strap (14). A respirator mask (10) includes a body (18) and a face seal (12). A method of manufacturing a face seal (12) for a respirator mask (10) includes overmolding a material of at least a portion of an integrated strap (14) onto a body portion (38) of a buckle (16) such that a head portion (36) of the buckle (16) is exposed from the integrated strap (14), the buckle body portion (38) including a plurality of structural features (46) that enhances bonding between the buckle body portion (38) and the overmolded material.