05/25/2026
You have three hours without shelter before hypothermia becomes life-threatening. Not three days. Three hours.
Just published a complete survival shelter field guide — 7 sections covering every build from a 20-minute lean-to to a full debris hut capable of keeping you alive in near-freezing temps with no fire and no sleeping bag.
Plus tarp configurations, snow and desert specialized builds, and the ground insulation science most survival guides completely ignore.
20+ years of testing these builds in Northern Michigan backcountry went into this one.
👉 https://www.outdoortechlab.com/survival-shelter/