Fifata Silicone Band Protective Case For Polar M430 M400 Sport Watch Strap Bracelet+protector Shell Cover For Polar M400 / M430 - Smart Accessories - AliExpress
Lijinlan Silicone Wristband for Polar M400/M430, Classic Soft Adjustable Replacement Wrist Watch Band for Polar M400/M430 Watch Accessories (A1-black)
Amazon.com: Weinisite Watch Band for Polar M400/Polar M430 Watch Band,Replacement Soft Silicone Band For M400/Polar M430 Sport Watch (Black) : Sports & Outdoors