The Luxie Charm Love Notes Scent Hearts is a NICU scent hearts set. It suits NICU families needing correctly-sized comfort.A simple exchange that keeps parent and baby connected across hospital hours. Love Notes is the detail the camera roll remembers. Two hearts per set per listing Double-layer bamboo viscose per listing Parent-baby scent exchange design per listing Wash before use per listing How do they work?Wear one heart for 24 hours so it absorbs your scent, then place it with baby; the second heart captures baby's scent for you to keep close, per the listing. It survives the wash cycle, the diaper bag, and the grandparent rotation intact.What are they made of?Double-layer bamboo viscose - soft, absorbent, and scent-retaining, per the listing.What sizes are the hearts?A larger heart about five by five inches and a smaller one about four by four, per the listing - discreet enough to wear.Match the collection via the Forever Rainbow Scent Hearts. Pairs well with Double-Layer Bamboo Viscose Scent Hearts, Forever Rainbow Scent Hearts, and Midnight Scent Hearts.