Lightweight Flame-Retardant First or Second Layer Regular fitting. Lightweight Flame-Retardant First or Second Layer - Regular fitting. Designed to fit regularly for comfort and full range of motion. Neither snug nor loose. Allows for unrestricted movement. Ideal for temps between 40? - 100? F.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }