Due to the shape of these plugs, we recommend that you only wear these for 5-7 hours MAX at a time. The circulation of blood flow can be affected if worn for any longer than that. If you're worried about this you can order a size down and they should still fit. Please also note that these should NOT fit very tight. They should fit comfortably. Otherwise you may run the risk of tearing your ears or causing a blowout. Do not be afraid to reach out to our support team for their recommendation of sizing based on information you provide.