The Vilros Raspberry Pi 4 Wave Case is a Case designed to passively provide massive cooling to a raspberry pi 4  board.
Not only does the case contact the on board chip to pull heat away from the board it also features a wave/fin design to dissipate the heat from the case.

Case Features:

• GREAT PASSIC COOLING CAPACITY: Aluminum Alloy super conductive material for maximum passive cooling--Fin Based Design--Chip Contact for passive cooling
• EASY PORT ACCSESS: Full Accsess to USB, HDMI Power Ports -- Case also features Rubber covers for camera module cable as well as GPIO port acsess 
• OPTIONAL SD CARD SECURITY: Includes optional SD card cover to secure SD card and make it unremovable without opening case.
• CAMERA MOUDULE COMPATIBLE: Camera Module mounting capability with hole for camera module cable as well as mounting holes and  screws top to mount the camera module to the case included