Lightweight Weather Shell & Emergency Bivy Wrap

Carry the light kit that keeps you warm and findable if weather turns or you get stuck.

Beginner

4 min

LIGHTWEIGHT WEATHER SHELL & EMERGENCY BIVY WRAP
[ ] 2.5-Layer Rain Shell
[ ] Mylar Emergency Bag
[ ] Safety Whistle

2.5-Layer Rain Shell: a thin waterproof shell that packs small. Check that the seams are taped.
Mylar Emergency Bag: a single-use sealed bag that reflects body heat. Repack it after any test.
Safety Whistle: loud, plastic and attached to your vest or pack.

Stay dry and out of the wind. Wet clothes in wind lose heat fast. Put the shell on early, before you are cold. Why it matters: runners generate heat when moving and lose it quickly when they stop.
Use the bivy to hold heat, not as a plan. An emergency bag keeps body heat in while you wait for help. Practice opening it at home, because cold hands struggle with packaging.
Signal for help. Three whistle blasts is a widely used distress signal. Check the managing agency or a local search and rescue source for current local guidance, and call emergency services when you have signal.

Gear types only.

Packable rain shell with a hood
Emergency bivy or space blanket
Pea-less whistle
Thin running gloves and a warm hat
Wild Dirt clothing and headwear for post-run layers (clothing and headwear categories)

Trail closures, weather advisories and race gear requirements vary by park, event and region. Check current local rules with the managing agency or race director: nps.gov, fs.usda.gov or your state park website. For current weather alerts see weather.gov.

Weather changes faster than your pace. A shell, a bag and a whistle weigh almost nothing and can matter a lot. Built by explorers, for the trail.

Check the weather

Look at the forecast the night before and again before you leave
Check for wind, rain, temperature drops and storms
Pick a shorter route if the forecast looks risky

Wear and carry

2.5-Layer Rain Shell packed in a small pocket or the vest
Try the shell on over your running top before the run
Hood fits over a cap and adjusts without blocking your view
Warm hat and light gloves for exposed routes
Extra thin base layer in a zip bag

Emergency kit

Mylar Emergency Bag in a small, sealed pouch
Safety Whistle clipped where you can reach it
Phone in a zip bag with the battery charged
Small first-aid kit with tape and plasters
ID and emergency contact details

Tell someone

Share your route and expected finish time
Choose a check-in time to message them
Carry a map or downloaded offline route

If you get stuck

Stop moving and get out of the wind
Put on all your layers, then get into the Mylar Emergency Bag
Use the Safety Whistle in sets of three blasts

Check the weather

Look at the forecast the night before and again before you leave
Check for wind, rain, temperature drops and storms
Pick a shorter route if the forecast looks risky

Wear and carry

2.5-Layer Rain Shell packed in a small pocket or the vest
Try the shell on over your running top before the run
Hood fits over a cap and adjusts without blocking your view
Warm hat and light gloves for exposed routes
Extra thin base layer in a zip bag

Emergency kit

Mylar Emergency Bag in a small, sealed pouch
Safety Whistle clipped where you can reach it
Phone in a zip bag with the battery charged
Small first-aid kit with tape and plasters
ID and emergency contact details

Tell someone

Share your route and expected finish time
Choose a check-in time to message them
Carry a map or downloaded offline route

If you get stuck

Stop moving and get out of the wind
Put on all your layers, then get into the Mylar Emergency Bag
Use the Safety Whistle in sets of three blasts