This one's for the mamas. Our Founders spent a combined 3.5 yrs breastfeeding. Nothing quite cut it, so they made one. *411* In pregnancy and postpartum, cup size fluctuates a lot , so owning 2 sizes can be helpful. We recommend going with your regular size and one size up for your fuller days. Plus with all the washing and wearing, owning 2 comes in handy - trust us. Preference also plays a role - if you prefer more cup coverage and a roomier band, you might consider sizing up Wide plush elastic band for extra comfort + support Adjustable straps and hook & eye closure in the back Wireless *FABRIC* Belgian stretch nylon is buttery smooth and wispy thin For the early days of breastfeeding, we recommend getting 100% cotton inserts to absorb leakage — we love the ones from TL Care! 75% Polyamide (Nylon) 25% Elastane (Spandex) Certified Safe: OEKO-TEX® STANDARD 100 #23.HCN. 86212 by Hohenstein HTTI Machine wash warm, hang dry