Dome tent dimensions h x w x l 145 x 260 x 375 cm poles fibreglass capacity 4 man poles fibreglass outer material polyester outer material properties 185t pu coated inner materials polyester breathable 185t hydrostatic head flysheet 2 000 mm base material polyester pole diameter 95 mm security standard fire retardant material pack size 62 x 20 x 20 cm