Is a TT helmet worth it for a beginner triathlete?

Yes, a TT helmet is one of the most cost-effective aero upgrades available and is worth it even for beginners who are committed to triathlon. The watt savings are significant and consistent regardless of your fitness level—you get the same aerodynamic benefit whether you're riding 30 km/h or 45 km/h. However, if you're still developing your aero position and frequently sit up or move your head, an aero road helmet might be more practical until your position is consistent.