Imodeli yakudala, ende enelaphu langaphandle kwi-hardwarearing, Ifanelekile kwimisebenzi yasebusika ephantsi kakhulu kwimozulu epholileyo yasebusika, xa kungekho nto ivumelekileyo ukuba ikuthintele ukuba uphume ngaphandle, ukusikwa kukusetyhini kunye nesisa ngaxeshanye, ngoko kukho indawo eninzi. ukwenzela i-insulating layers ngaphantsi.Kukho ihood ephangaleleyo kwaye ehlengahlengiswayo.I-zipper yindlela ezimbini kwaye igqunywe nge-flap yokukhusela ebanzi.