15D Ultra-Sil®
![15D Ultra-Sil®](http://seatosummit.eu/cdn/shop/articles/15D_UltraSil_cfebc5f6-db6e-4163-88c3-d305be18c768.png?v=1653006154&width=1200)
One of the lightest coated fabrics that Sea to Summit manufactures, the 15 Denier Ultra-Sil is a siliconized nylon fabric with a polyurethane (PU) inner coating for mild waterproofing. This ultralight fabric has a 1,200mm hydrostatic head.