Tunnel tent festival tent capacity 4 man poles fibreglass application inexperienced campers series vango adventure colours black green outer material polyester outer material property pu coated hydrostatic head flysheet 3 000 mm hydrostatic head groundsheet 10 000 mm base material polyethylene security standard fire retardant material included in delivery groundsheet pegs guylines technologies powerflex fiberglass poles protex pack size 60 x 2