List of features and specifications for THAW Heated Insoles: - Rechargeable - Bluetooth-enabled - Comfortable fit with various types of footwear - Trimable for proper fit - Water-resistant IPX4 rating - Resistant to sweat, moisture, and water splashes - Not waterproof, should not be submerged in water or worn inside fishing or wading boots - Suitable for wearing inside boot-foot waders and stocking-foot fishing waders - Can be charged without removing from boots or waders - Compatible with Android and iOS platforms - Adjustable settings - App-controlled warming for feet - THAW app monitors battery life - Streams weather forecasts - Package includes two Bluetooth-enabled insoles and USB dual-charging cable with wall adapter - Sizing information available in the size chart image.