Cotton/Lycra blend
Customer Reviews:
hands free 
This makes pumping so much easier. Get work done around the house, play on the computer, feed one baby while pumping, many possibilities. Must have for any serious pumping mom.
So much easier! 
This makes pumping soooo much easier! I can actually have my hands free to comfort my baby, read, play on the computer, change the channel on the TV…. instead of just sitting there for 20-25 minutes 6 times a day, holding the suction cups in place, unable to do anything else. My one recommendation is that if you’re deciding between two sizes, go with the smaller size. Also, go by your bra size, not your shirt size. If the bra is too big, you’ll have problems with leakage. You want it to be snug to get good suction and not have the cups moving around. I wish I had gotten this right after my daughter was born, instead of when she was almost 2 months old. It definitely makes pumping more bearable and I probably would have been tempted to give up by now if it weren’t for this product.
Quick and Easy to Use 
I bought this and the halter top version just in case it didn’t work but this one is definitely easier, sturdier and quicker to use. I fits snugly and zips on in just a few seconds. (Make sure to read the other reviews on sizing to find a comparable size to you. They run a little big… I am 36 DD and I wear a medium.) I have been pumping eight times a day (baby won’t nurse) so I am definitely getting some wear out of the product but after a month it still fits and works the same. It folds flat to fit in Medela pump n’ style bag, even with other accessories and cooler in bag as well.
Makes working FT so much easier! 
I hate pumping…but this bustier makes it much more bearable to do 3 times a day at work. It allows me to keep my hands free to read a book, eat a meal, talk on the phone, etc. without worrying about making a mess. I highly recommend this accessory for any woman that has to pump full time!
Gave me my hands back 
I was looking for some way to free my hands during the 10 pumpings a day, and to be able to keep working at my laptop at work, and this was it. I bought a couple in size large (I’m a 42D after pregnancy) and it is just a little too tight, so I’m going to try an X-large next. But it works perfect other than being tight and hard to zip up completely on the first wearing after washing. I use it with my Medela Pump-n-style Advanced, and the Medela 27mm and 30 mm shields fit fine through the holes. I find there is a little bit of a juggling act when pulling the valve assembly off the shields and then to pull out the shields quickly enough to avoid drips, but once you get the hang of it and if you have a paper towel handy you’re fine. Good product.