Flamingo Dog Cooling Bandana - S Pack Of 2 Cooling collar - neither water nor a refrigerator are required. In summer you should always have this practical cooling bandana with you - it cools quickly and all by itself due to its gel filling. The gel filling is non-toxic and comfortably soft. If the coolling effect decreases, the cooling bandana only needs to be put at a cold place like a shadow or a tiled floor - it recovers after a short time and then cools again.