Kenda's single tread compound construction uses the same compound over the whole tread of the tire. This construction is found in many road, gravel, commuting and some mountain bike tires. The characteristics of the compound itself vary between each category - a commuter tire's compound will be more durable than a mountain bike compound - or even within the category as Kenda adapts the compound to each tire. A mountain bike tire that is intended to perform well in wet conditions will have a different compound than a tire that is meant to excel in dry conditions. That way you can also be sure to get a tire with a compound that was fine-tuned for that particular tire.
Dual tread compounds use two different compounds. The center of the tread uses a firmer compound to improve rolling resistance and create stronger breaking edges, while the transition area and shoulder of the tire uses a softer compound for increased cornering control and grip. Kenda uses a dual tread compound mostly in mountain bike and gravel tires, but even some road tires benefit from the dual tread construction.
Kenda's dual layer tread compound uses a stiff compound as the base with a soft compound laid over the whole tread. The firm bottom layer serves as the foundation for the softer layer to push against, keeping the knobs stable through breaking and cornering while providing plenty of grip. The result is a compound that provides better control and lasts longer than previous versions. The Dual Layer compound is used exclusively in tires with AGC and AEC casings.