Modern ones obviously include a lot of comfortable features that you may not find in the old ones. (omgstroller.com)
Meanwhile, the best ventilation is provided by wire bars, but solid flooring is the safest and most comfortable feature for most small pets. (petbusiness.com)
The generator helps the engine restart with almost no noise or vibration, making the stop - start system a more comfortable feature to live with. (topspeed.com)