Knirps Umbrellas - Windtunnel Test T.Series I Knirps - Since 1928 - YouTube
Umbrella tested in the wind tunnel
Knirps Ultra US.050 Slim Manual Umbrella - Ultra Lightweight and Flat - Storm Resistant - Windproof - 21cm, Navy Blue with Case : Amazon.com.be: Fashion
Knirps T.200 / BMW Wind Tunnel Test at 112 km/h I Knirps - Since 1928 - YouTube