Westex partners with 3M to provide Thinsulate Insulation FR in our UltraSoft® fabrics. Our insulated fabrics offer lightweight warmth and comfort with the FR protection you expect from Westex. The lofty fibrous webs in the fabric trap more air to contain more of the body’s natural heat –– resulting in exceptional warmth and breathability, without excessive weight. Flame resistance is guaranteed for the life of the garment.OUTER LAYER UNDER LAYER ATPV 301 7 oz Shirt/Lt Wgt Coverall Twill 130 6 oz Knit 28.7 341 5.5 oz Light Weight Shirt 130 6 oz Knit 23.5 130 6 oz Knit 130 6 oz Knit 26.9 180 11 oz Fleece 301 7 oz Shirt Twill 45.2 180 11 oz Fleece 341 5.5 oz Light Weight Shirt 38.9 (Ebt) 180 11 oz Fleece 130 6 oz Knit 38.8 OUTER LAYER UNDER LAYER ATPV 301 7 oz Shirt/Lt Wgt Coverall Twill 301 7 oz Shirt Twill Shirt 27.2 341 5.5 oz Light Weight Shirt 26.7 451 9 oz Twill Pant 31.6 451 9 oz Pant/Jack/Coverall Twill 301 7 oz Twill Shirt 36.2 341 5.5 oz Light Weight Shirt 33.8 451 9 oz Twill Pant 38.7 801 13 oz Heavy Weight Sateen 301 7 oz Twill Shirt 51.5 341 5.5 oz Light Weight Shirt 51.1 451 9 oz Twill Pant 51.3 OUTER LAYER UNDER LAYER ATPV 801 13 oz Heavy Weight Sateen 341 5.5 oz Light Weight Shirt 51.1 301 7 oz Twill Shirt 51.5 451 9 oz Twill Pant 51.3