The most important piece of a virtual reality kit is the VR Glasses, a device like a thick pair of goggles that goes over your eyes. The more expensive, higher quality VR glasses need to be connected to a computer to run apps and games, while some cheaper ones use a mobile clipped to the front of the headset.
All glasses need to be used alongside a good quality pair of headphones, and there are other optional accessories from hand controllers to treadmills that are all designed to enhance your simulated experience of being in another world.
VR devices have their own app stores, similar to smartphone app stores, where you can browse and download games and apps. If you are an early adopter of technology, have a big budget, and enjoy playing high-end games, then a tethered headset will offer you the most realistic, immersive, inspiring virtual reality experience on the market today. Some of the headsets, particularly some of the cheaper ones made in China, are designed for watching movies on private screens on lower-end phones, and to compensate for the phones' low-quality screens, they have a narrower field of view.
In general, the lighter the VR Glasses the better they are. Otherwise, it can get really tiring if you plan to use it for any length of time. But shape and straps also play a factor—some heavier headsets distribute their weight so that they feel lighter, while other headsets seem to have their entire weight cutting into your nose. In addition, people vary—what fits well on one person may be painfully uncomfortable to another.However, a headset that is too light can also be a problem.
An option is to check whether the place you're buying from offers free returns, order a couple of viewers, and pick the one that works best.