The 600 has new features making it comfortable to wear, easier to maintain, and more durable, promising a long service life. The Apollo 600 is a single-shell helmet with two adjustable suspension options.
The Apollo 60 features double-shell construction, sound-deadening foam, and large window.
The Apollo 20 is the economical choice with simplified cooling and single shell construction.
If you are using a separate air pump to provide breathing air, choose the 600LP, 60LP, or 20LP.