Flannel shirt durability tracks with weight, weave density, and whether the cut accommodates layering. Filson's Alaskan Guide is 8oz heavyweight cotton—dense enough to resist pilling and fading, cut generously enough to layer without seam strain. Simple construction (button placket, chest pockets, full sleeves) means few failure points. Realistic service life is 15–25 years. The tradeoff is bulk; thi...
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