Thermafuse f450 One Pass Smoothing Creme is a temporary smoothing, straightening product. This styling product was developed for use with extreme heat flat irons and appliances up to 450 degrees. Thermafuse One Pass provides moisture and protein conditioner to combat dry, brittle hair caused by extreme heat. It reduces friction and cuticle abrasion while promoting fast and easy styling. Thermafuse One Pass increases thermal protection by 20% or more and makes hair smooth and sleek, with incredible shine.