Density refers to the spacing between the individual tufts or loops that make up the carpet pile. Dense carpet packs more fiber into the pile so that it wears longer, resists crushing and matting better and retains its texture longer in heavy use. Dense carpet also helps resist stains and dirt by keeping them on the surface of the pile, where they're more easily cleaned away. You can compare density by bending the two carpet samples as they would be bent over a stair thread. The look into the pile. The higher density carpet will show more pile fiber and less of the backing material. Or dig your fingers into the pile. A high density carpet will make it difficult to feel the backing.

While density is the most reliable indicator of quality, the height of the carpet pile and the amount of fiber are also used as a measure. In carpets of equal density, the one with the higher or the heavier pile will generally perform better. As a general rule, the deeper and the denser the pile, the better the carpet will perform. These easy tests will allow you to quickly compare the quality of loop pile and velvet carpets. For most cut pile constructions, however, you'll have to consider twist level and twist stability as well.

Carpet yarn is formed by twisting two or more yarn strands together before tufting. The tighter the twist, the better a cut pile carpet will perform. Look closely at the individual yarn tufts. The twist should be easy to see, tight and neat throughout. Twist level will usually be adequate if the tips of individual tufts are neat, tight, and well defined, not loose and flared open. Then ask if the yarn has been heat-set. Heat-setting gives the yarn a "twist memory," stabilizing the yarn to retain its twist through years of use in your home.

Carpet Cushion : it adds comfort and life to your carpet.
The purchase of a good carpet cushion adds greatly to the comfort of carpet. Carpet cushioning performs several important functions, and you should consider it an integral part of every carpet purchase.

• Properly installed carpet cushion can add 17% to 50% to a carpet's useful life.
• It cushions up to 90% of the impact of foot traffic.
• It protects the pile against crushing and protects the backing.
• It creates a more comfortable walking surface.
• It insulates cold floors and absorbs room noises.

Rubber or urethane foam, rubber waffle and various felts pads are most commonly used. Most are offered in several thickens and patterns, and most stores will offer a good selection. A medium thickness is usually the best place to start. Thin pads can tear, wear or disintegrate too quickly. Ultrathick pads, on the other hand, can be too soft for comfortable walking and balance. It's helpful to ask the salesperson to let you feel the effect of the carpet and pad together.