This is a must buy with the carrier. I had to order it after the carrier as sure enough when I used the carrier for the first time my baby starting sucking on the straps. These pads offer a little bit of protection.
Worth spending the few extra pounds to get these to save the straps of your expensive carrier. My six month old has already sucked on these and we've only had the carrier for a week or so!
We knew from the state of another sling our baby had been riding in that he was going to suck, and suck he has. It's so much easier to just wash these small pieces than the whole sling, which is a good thing as the Ergo Performance instructions discourage you from washing the whole carrier as it will damage the material. We chose to buy two, as we use the carrier everyday, so we always have some on us when one pair is being washed. They are soft, hygienic and for us and our sucky baby, an essential additional to the Performance Carrier. Plus, they were much cheaper on Natural Nursery than other sites we looked at.
I didn't initially buy these with my carrier but the first time i used the sling my baby soaked the strap by sucking on it. So i got a couple of pairs of these and i'm happy they will prolong the life of the carrier and be a bit more comfortable and hygienic for my baby. They are nice and soft against my babys face too when he falls asleep in the sling and slumps a bit.