Magento Improved Layered Navigation is a well tested 5-year-old bestseller on the Magento market. Throughout this time Amasty has been constantly fine-tuning the existing features and adding new ones to maintain the status of the top navigation extension. Amasty support team knows all 7 parts of Improved Navigation to the tips of their fingers. The above factors enable us to offer you a great product at a reasonable price and provide quality support service at the same time.

As it's stated above, this extension combines features of 7 mods:

 Some of the features include:

 You can find all the necessary info and details on Amasty site http://amasty.com/improved-layered-navigation.html