Are portable garages actually waterproof and snow-resistant?

Most of these shelters use PE tarp covers marketed as waterproof and UV-resistant, and verified-purchase reviewers generally confirm they shed rain well when properly tensioned. Snow load is the bigger variable: owners repeatedly stress that flat or sagging roofs pool water and collapse under heavy snow, so the round-top and reinforced-frame models tend to fare better in winter climates. Clearing snow promptly matters more than the marketing claims.