エクスプレスカップ用インサート

The inserts slide right into the Express Cups flanges and hold their position perfectly, no shifting while I pump. They make the fit feel custom-tight, and the pair setup means I'm never fumbling for a spare mid-session.

Not sure if my flange size is slightly off, but these inserts don't stay in place perfectly during pumping. They do help with alignment and feel reasonably comfortable.