Temples are those arms which are attached to either side of a pair of aviator sunglasses
which go from the front of the sunglasses frame backwards on the side of the wearer's head and over their ears. The purpose of temples is to hold the sunglasses in place for the wearer allowing them to keep their hands free for other tasks. Over the years there have been many improvements in aviator sunglasses temples including the material and style of temples offered.
Bayonet Aviator Temples
were designed for military pilots to slip easily under helmets or headsets. Early on military pilots found it necessary to remove their sunglasses - for example when passing into and out of weather - and that it was a challenge to remove a helmet or headset to take the aviator sunglasses off or put them back on. Bayonet temples make it simple because they go straight back and don't curve down behind the ears. Therefore sunglasses with bayonet temples can easily be removed and replaced without removing you're headset or helmet. If you wear a helmet, headset or other headgear bayonet aviator temples are a great choice for you.
Do Bayonet Temples Fall Off When Lowering Your Head?
The bayonet temple arms go straight back but have an inward curve that follows the curve of your head and fit snugly against the head. The bayonet style aviator temples have enough curve in them and are rigid enough and fit snugly enough so they will not fall off even when looking down at a chart or looking inside the cockpit.
Skull Aviator Temples
Skull aviator temples are often called "Hockey Stick" temples because of their resemblance to hockey sticks. The skull temple arms go back along the side of the wearer's head and then curve down over the back of the ear. This type of aviator temple is like the standard temples you would find on an ordinary pair of eye glasses you get from the optometrist. Because not everyone is a pilot, nor uses helmets, headsets or other head gear, skull aviator temples work well for them. However, for some people skull aviator temples don't work well because they can irritate the back of the ear lobe causing some discomfort over time. Because of this some people think about using the bayonet style of aviator temple but are concerned that they will not remain stable on their head while performing tasks when their head needs to be lowered. Some people are concerned that aviator sunglasses with bayonet temples might slip off their heads; however, as a pilot I have worn this style of aviator temple for years with no problems whatsoever.
It's Your Call
In the final analysis it is up to the wearer to choose the correct aviator temple style for themselves. I hope this has been helpful to answer the "Bayonet vs Skull Temples" question for you. Have a prosperous day!