Advantage
Apply modern technology from Japan
Tested and certificated wind pressure, waterproof, air-tight JIS A1515, A1516, A4702
Air-tight rank A-4 (JIS 1516, JIS4072)
Waterproof rank W-5 (JIS1517, JIS 4072)
Resistance against wind pressure rank S-6 and 7 (JISA 1515, Jis 4072)
S Tight: can withstand up to 1 meter in water height
W Tight: can withstand up to 3 meter in water height.