This Elizabeth collar is waterproof and easy to clean. The flower style is also very cute.
Size description by weight:
S-recommended for cats weighing 0-3kg/0-7 Ib
M-recommended for cats weighing 3-6kg/7-13 Ib
L-recommended for cats weighing 5-9kg/11-20 Ib
Size L is recommended for cats after a sterilization surgery.