Raised feet or an elevated design create space under the rack for airflow, which promotes more even cooking and cooling and keeps food from sitting directly on the pan.
Common features that lift food and let drippings fall away include elevated wire designs, perforated broiler tops, and raised feet; these also improve airflow for crisper results.
Reported weights range from about 0.23 pounds up to 1.7 pounds, depending on size and construction.
Care instructions vary by product: several listings recommend hand washing, some state the rack is dishwasher-safe, and a number of listings do not provide specific cleaning details.