Tested at 104°F. Still cooling after 2 hours. Most cooling products fail in 20 minutes. Vilos uses 99% PCM (Phase Change Material) to deliver dry, consistent 64°F cooling — no batteries, no water, no mess. Just freeze for 20 minutes, snap it on, and work. Why Workers Are Switching to Vilos 2-Hour Cooling at 104°F — 3-6x longer than Amazon PCM generics 360° Segmented Gel-Cell Design — full neck coverage, not a narrow U-shape Completely Dry — no condensation, no dripping, no soaked shirts 20-Minute Quick Refreeze — fridge, cooler, or ice water Skin-Safe 64°F (18°C) — cool enough to work, zero frostbite risk Featherweight 5.1 oz (145g) — forget you're wearing it How It Works Freeze — 20 minutes in any fridge, cooler, or ice water Snap On — 360° wrap with snap closure, no ties or adjustments Swap & Repeat — grab the fresh one from your cooler bag for all-day cooling 2-Pack All-Day Kit — The Smarter Way to Beat the Heat The #1 complaint about PCM products is they don't last long enough. Our 2-Pack + Insulated Cooler Bag solves this — swap rings for continuous cooling through your entire shift. Zero downtime. Specs Material: 99% PCM + TPU Shell Phase Change Temp: 18°C (64°F) Weight: 145g (5.1 oz) Cooling Duration: Up to 2 hours at 95-104°F Refreeze Time: 20 minutes Closure: Snap-on, one-hand operation BPA-free, non-toxic What This Product Is NOT Vilos is not a portable AC. It won't make you feel "cold." It takes the dangerous edge off extreme heat so you can keep working safely. In 110°F+, expect 60-90 minutes per ring — that's exactly why the 2-Pack rotation system exists. 30-Day Money-Back Guarantee · Free Shipping · From the makers of Vilos heated reflective workwear