Waterproof or not:Yes.
eBay
2" Stainless Steel Scuba Diving Weight Belt Slide Keeper D Ring Webbing Harness Belt Retainer Stopper Freediving BCD Accessoires
Aliexpress UK
Type: Chest Strap. Features: Quick Release, Adjustable.
eBay
Iron Racing Safety Seat Belt Chassis Roll Harness Bar Rod Applicable for Seat Belt Protection Rods At 4-Point 5-Point 6-Point
Aliexpress UK
1 x Adjustable Chest Harness Mount. - Colour: Black. - Adjustable strap easily fits all sizes. 1 x Black Carry Bag.
eBay
High Quality Free Diving Webbing Harness Belts Retainer Stopper D Ring Scuba/Diving Weight Belt Slide Keeper
Aliexpress UK
Item type: wearable to hang on the neck brace. 1set neck holder. Simple operation, adjustable shooting angle of view height.
eBay
2 Pcs Diving Shoulder Strap Pads For Scuba Diving For-BCD Backplate Harness Belt And Backpack Replacement Shoulder Mat Water
Aliexpress UK
Features: -Comfortable, fully adjustable design fits all sizes. -Made of high-quality elastic nylon and ABS buckle, strong and durable. -Be hands-free, capture the footage without holding the camera in your hands -Easily removable, simply loosen the thumb screws to adjust the angle or swivel up or down 90 Degrees to quickly view or edit your footage. -Perfect for skiing, cycling, canoe and more other sports activities use. Specification: Colour: black Material: nylon+ABS Suitable for device size：4-7 inches Package Included: 1x Chest mount strap 1x J hook 1x Adapter 1x Screw 1x Phone holder .
eBay
1set Scuba BCD Harness Shoulder Strap Adjuster with Quick-release Buckle Prevents Straps From Slipping Off
Aliexpress UK
Compatible with GoPro, DJI Osmo Action, Insta360, SJCAM, EKEN. Fully adjustable elastic strap for secure and comfortable fit. Type: Chest Strap Mount. Material: Nylon Elastic. 1 × Chest Strap Mount. Lightweight and durable nylon construction.
eBay
Ebike 1T4 EB-Bus Cable Harness for Bafang BBS01 BBS02 BBSHD Mid Drive Motor Display Brake Lever Thumb Throttle Connector
Aliexpress UK
Insta360 X3 / X4 / X5 / one X2 / GO 3 3S / Ace Pro / ONE RS / GO Ultra. DJI Osmo Action 1/2/3/4/5PRO. GoPro Hero 13 12 11 10 9 8 7 6 5 4 3 Black Max. 【Chest Strap】. Xiaomi Yi 4K+ / APEMAN / Dragon Touch.
eBay
Main Power Wire Wiring Harness For Surron Sur Ron Lightbee X S Electric Dirt Bike Play and Plug Battery Connector Cable Wire
Aliexpress UK
Lightweight, durable, and comfortable, it’s perfect for skiing, biking, motocross, paddle sports, and all outdoor adventures. HERO13 Black, HERO12 Black, HERO11 Black Mini, HERO11 Black, HERO10 Black, HERO9 Black, HERO8 Black, HERO7 White/Black/Silver, NEW HERO, HERO6 Black, HERO5 Black, HERO5 Session.
eBay
40LBS Sidemount SCUBA Diving BCD 2025 SS Harness with 4 Removable 2kg Weight Pockets Diving Equipment for Underwater Sports
Aliexpress UK