Comfort and stability are the two most important elements of a modern lounge chair, or any chair for that matter. A modern lounge chair often features smooth lines and curves, interesting, eye-catching designs, and colors that fit the aesthetic of a particular room. Designs focus just as much on aesthetics as they do on comfort, so be sure to choose a chair that is attractive but still comfortable enough to use regularly. Some designs tend to be somewhat precarious, so if you will be using your modern lounge chair in a home with children, be sure to consider whether the chair is durable enough to handle that kind of use.
The best modern lounge chair will fit well in the room in which it will be placed, both in terms of size and aesthetics. Some modern designs tend to take up a significant amount of space due to the long curves or lines of the chair, so be sure the chair will fit well in the room and not obstruct regular traffic through the room. Other modern lounge chair designs are quite compact, so be sure the chair is not so small as to be less useful or likely to be lost in the room. More importantly, look for a chair that fits the aesthetic of the room; do not choose an outlandish design for a cozy and quaint room, as it will look out of place and uncomfortable. Similarly, do not choose a plain looking chair for a room with more flare.
Think about the style of the chair carefully and consider how stylish this chair will seem in a few years. Modern lounge chair models tend to be somewhat expensive in some cases, so purchasing one should be considered an investment. If, after a few years, the design you choose seems gaudy or out of date, you may regret the purchase. If your home decor is more conservative, choose a modern lounge chair with classic lines and materials, such as hardwoods and leather. If your decor is a bit more adventurous, consider other materials, less common lines, interesting aesthetics, and new types of comfort systems. Don't be afraid to branch out, but consider how the chair will fit in with the rest of your decor before taking the plunge and purchasing. Consider ergonomic designs as well that will provide a new level of comfort.
Solid construction is crucial. Be sure all woods used are glued, screwed, nailed, or otherwise secured properly to ensure longevity and support. Metal chairs should be constructed from a sufficient gauge of metal, and welds should be neat and solid. Upholstery should feature clean lines, solid seams, and well secured materials.