It has flouro silicone inner layer. That withstands all the chemicals and liquids. Burst pressure to 245psi.Temps from -60 to +500. Then 3 reinforced fire retartdent silicone layers. Silcone coolant hoses are more pressure resistant,more temperature resistant then oem rubber hoses.Do not fall apart with age Like oem rubber hoses.They come with Stainless Steel replacement clamps & Lifetime Warranty.Working temperature: -65F to +500F degreesBursting Pressure: 245 PSIThickness: 4.5mm, 4 plyDo it and forget about it upgrade. 1 less thing to worry about on or off road.