Family tent tunnel tent capacity 6 man poles aluminium steel application camping series outwell premium colour grey outer material polyester outer material property pu coated inner materials polyester breathable hydrostatic head flysheet 5 000 mm hydrostatic head groundsheet 10 000 mm base materials polyethylene pu coated pole diameters 19 22 95 mm anchoring luminous guylines security standard fire retardant material included in delivery