While nylon is stronger than cotton, that comparison is only for fabrics of equivalent weights. Most silicon-coated nylon tents measure between 40 and 70 Denier. A single strand of silk is one Denier.
This six-person tent is the most under-the-radar deal at Dick's right now, and we wouldn't be surprised to see it sell out again within a few days. Although it's only available in a single color ...