Nothing will harsh on your mellow like a flat. But with the Michelin Pro4 Endurance road bike tire you don't really have to worry about that. It's got increased puncture resistance and a hard wearing compound for long training rides, but is still lightweight and fast rolling enough for race day.
Dual compound tread has excellent wear resistance and enhanced grip
Grey, yellow and red compound used on tire shoulders provides excellent grip on wet roads and hard corners
Puncture resistant compound used on center helps prevent punctures and cuts
110 TPI casing and bead-to-bead breaker ply provide excellent durability and a smooth, buttery ride