I'm not sure of the kind of proofing but Paul definitely said it was proofed and it is long lasting stuff as long as care is taken when washing it.
He said use the minimum amount of detergent and choose something very gentle like pure soap flakes which you can buy in packets from supermarkets or Ecover's handwashing liquid.
He said use the minimum amount of detergent and choose something very gentle like pure soap flakes which you can buy in packets from supermarkets or Ecover's handwashing liquid.