Shipping labels in a format of 199.6 x 143.5mm with 2 labels per sheet for laser printing and are ideal for use on any packaging materials including polythene or Tyvek? envelopes. Send the right message and make sure your parcels arrive safe whatever the weather conditions. Avery waterproof paper labels are resistant to water, prolonged UV exposure, abrasion, and chemicals/solvents. Meaning that they stay intact with no smudging of text, so the address remains easy to read.