anyone buy the mattress cover from the New Zealand study?

A&B September 17

A while back someone posted a link to a SIDS study out of New Zealand which also sold the mattress cover used in the study.  Did anyone buy one?  If so, does it seem different than a regular mattress cover?  Does it fit the mattress well?  Is it waterproof?  Would you recommend buying one?  If you do, can you post the link b/c I can't find it.  LO has fully transitioned to her crib and loves to tummy sleep which already worries me enough!