SUR-FIT Natura Durahesive Skin Barrier with Flange SUR-FIT Natura Durahesive Skin Barrier with Flange without tape collar. Protective skin barrier with low profile cut-to-fit flange. SUR-FIT Natura Durahesive Sizes and Options Flange Size: 1 1/4" - Barrier Size: 4 x 4" Flange Size: 1 1/2" - Barrier Size: 4 x 4" Flange Size: 1 3/4" - Barrier Size: 4 x 4" Flange Size: 2 1/4" - Barrier Size: 4 x 4" Flange Size: 2 3/4" - Barrier Size: 5 x 5"