Montana-inspired western styling that happens to be a proper technical shirt. The Big Sky looks like something you would wear to dinner and works like something built for a July float — UPF 50+ with a vented mesh-lined back panel.
Specifications
| Fabric | 57% polyester / 40% nylon / 3% CDPET |
|---|---|
| Sun protection | UPF 50+ |
| Back | Vented mesh-lined panel |
| Pockets | Two chest — accessory loop in the right, sunglass stowage in the left |
| Styling | Classic western |
| Care | Machine wash and dry |
The vented back is the part that matters. A shirt can be UPF 50+ and still be miserable at two in the afternoon if the air cannot move through it. The mesh-lined back panel is why this one works in real heat rather than just on a spec sheet.
Sizing
| Size | Chest | Neck |
|---|---|---|
| S | 36–38" | 15.5–16" |
| M | 39–41" | 16–16.5" |
| L | 42–45" | 16.5–17" |
| XL | 46–48" | 17.5–18" |
| XXL | 49–51" | 18.5–19" |
| 3XL | 52–54" | 19.5–20" |
Body measurements, not garment measurements — measure your chest at the widest point. Simms does not publish a fit description for this shirt and does not flag it as running small. Current pricing is on the selector above.
Short sleeve or long? We stock the Big Sky LS in the same fabric, same UPF 50+, same vented back and two-pocket layout. On western rivers the long sleeve is genuinely the more useful shirt — it covers your forearms, which is where most anglers actually burn. The short sleeve is the better call if you wear a sun glove and hate rolled cuffs.
Also worth a look: the Big Sky Tech LS is a different build — 93% nylon / 7% spandex, lighter at 111 gsm, with DWR, odor control, and a built-in sunglass chamois at the hem. More technical, less western. Also stocked.
Care: machine wash and dry, per Simms. Skip fabric softener.
Ed's Fly Shop, 432 E Main St, downtown Montrose, Colorado.
