A fully in-bra, cord-free, tubeless pump that lets you make dinner or take a call while you pump, for a premium price.
The Willow's whole pitch is freedom: it tucks entirely into your bra with no cords, tubes, or dangling bottles, and its spill-proof design even lets you lean over. That convenience is genuinely life-changing for some pumpers, but output can be lower than a plug-in pump, and the proprietary bags or reusable containers add ongoing cost. It's a lot of money and rarely fully covered by insurance. Skip it if budget is tight or you need maximum output, where the Medela does more for far less.