Very light-weight and extremely flat. These are the key features which characterize the HELIOS and make it so comfortable to wear. Another feature which will impress you is the first-class workmanship of the HELIOS. As the watch case is made entirely of stable yet extremely light titanium, the total weight of the HELIOS is just 28g (55g with titanium strap). The flat sapphire glass is highly resistant to scratches and breaking. The HELIOS is waterproof to 3 bar.