If you have bought a motorcycle helmet you can significantly increase the comfort around it. Kollen and helmet hats are available for summer and winter use. If you ride with a jet helmet, a summer coat can protect you against flies without it feeling warm. For the winter, a windproof collar can protect you from drafts and cold.
Communication systems are a godsend if you want to be reachable on the road or if you want to discuss with your motorcycle buddies on the road which exit you will take. Communication systems come in many different types from a simple entry level model for just your phone and GPS. Up to a system for 10 riders.
Hearing protection is a must if your helmet is not super quiet and you travel long stretches on the highway. A ringing in your ears is the last thing you want and by using hearing protection you can combat this. In addition to possible hearing damage, it is a lot comfortable with the constant noise of the driving wind around you.