Fill a sink or tub with warm water
Submerge the Crocs for 1 to 2 minutes
Remove them and put on thick socks
Wear the Crocs while they are still warm
Walk around until they cool and stretch slightly
Repeat if needed
Avoid boiling water
Avoid high heat from dryers or ovens
Let them air dry at room temperature
Use shoe stretchers if needed for a more gradual stretch