Tunnel tent family tent pack size 32 x 89cm cable entry point ows system force 9 wind stabilizer system capacity 5 man poles fibreglass series outwell evolution outer material polyester outer material property 75d inner material breathable polyester hydrostatic head flysheet 4 000 mm hydrostatic head groundsheet 10 000 mm base material polyethylene pole diameters 11 127 85 mm anchoring luminous guylines adjustable fixtures assembly time shor