I went to the Croc sight and looked up their fact sheet this is what it said.
How do I care for my Crocs shoes?
Fit: to adjust your Crocs shoes, grasp the heel strap with both hands on either side of the ""crocs"" wording and gently stretch outwards from the middle until it retains the desired fit. For a customized fit that can be adjusted for any activity, use the crocs turbo strap.
Clean: keep your Crocs shoes clean by rinsing them with cold water and soap, or to bring them back to their original luster, try crocsbutter. Do NOT clean Crocs in the diswasher or washing machine.
Heat: do not expose your Crocs shoes to extreme heat or intense sunlight for an extended period of time. Due to the unique nature of the Croslite PCCR material, high temperatures can cause them to warp.
Grip: Crocs shoes are known for their great grip but like any performance tire, when the tread becomes worn, their grip becomes compromised. That's when you know it's time to treat yourself to a new pair.
Mammoth Removable Liner Care Instructions
To remove liner:
Flip heel portion of liner to relieve pressure
Place thumb firmly on top of the exterior surface of the rivet and carefully peel liner back, away from the rivet
Repeat on other side
To replace liner:
Place liner on hand and tuck into the shoe, ensuring the liner toe reaches the toe of the shoe
Thread exterior surface of the rivet through slot in liner on each side of shoe
Pull heel portion of liner over the heel of the shoe
Test to see if the liner stays in place after as0sembly
Washing instructions: Machine wash cold with like colors. Line dry, do not use bleach.