Bloccs Waterproof Knee Protector is a reusable and durable waterproof sleeve, made of soft, flexible, high-quality latex rubber. Creates a watertight seal above and below the knee and can be fully submerged in water. Easy to put on and take off and comfortable to wear. Can be worn for up to 30 minutes, as long as it feels comfortable, isn't too tight, and is checked regularly. Longer use may result in trapped air causing perspiration and discomfort or reducing circulation. Correct sizing is crucial for a comfortable fit and a watertight seal. Please refer to the sizing charts. The protector can be worn for up to 30 minutes - providing it is still comfortable to wear , does not feel too tight and is checked regularly. Wearing the protector for longer than 30 minutes may result in trapped air causing perspiration, discomfort and may restrict blood circulation. Got questions? Check out our FAQ or, contact us, we’re happy to help Click here to view the Bloccs Waterproof Protector Care and Usage Guide Click the Sizing tab below or to the Image of the Measurement Guide to find out what size you are. If you are under medical care, we recommend getting your Doctor’s approval before using this Waterproof Knee Dressing Cover. If you have a latex allergy, please consult your medical provider before using the protector.