Is a neck gaiter warm enough for really cold days?

For temperatures below approximately -15°C (5°F), a standard neck gaiter may not provide sufficient protection, especially if you also lack coverage for your ears and forehead. On very cold days, you can layer a neck gaiter with a helmet liner or beanie that covers your ears and forehead. Windproof gaiters with softshell construction provide significantly more effective cold protection than standard fleece models. For sustained temperatures below -20°C (-4°F), a full balaclava is generally a better choice as it eliminates all gaps and provides complete head coverage.