The BoonNursh Transitional Sippy Lid was designed to fit perfectly onto bottle shells. It helps the transition from bottle to sippy cup.

Features:

SWAP THE TOP: Designed to fit perfectly onto NURSH bottle shells, youll have an instant array of colorful sippy cups.
EASY TRANSITION: Convert your babys favorite NURSH bottle to a sippy cup.
100% SILICONE: Dishwasher and sterilizer safe keeping them clean is a snap.
Made without BPA or PVC