What happens if I lift my head or look around in a TT helmet?

Lifting your head or looking sideways disrupts the smooth airflow over the tail, potentially making the TT helmet slower than a standard road helmet. The tail acts as a sail when misaligned, catching air and creating additional drag. This is why TT helmets are only appropriate for disciplines where you can maintain a consistent head position. Practice looking ahead with peripheral vision and use course reconnaissance to minimize the need to look around during your TT.