Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Awesome product!

These shells work really well in early breastfeeding to occasionally protect sore nipples. They also work for increasing milk supply throughout the day without added pumping. I use them to collect milk on the opposite side during my nightly feedings, and have stored up a lot of milk that way. The only reason they got 4 stars is because they are kind of hard and sometimes feel kind of obvious under certain clothing.