Comfort
Lightweight shoe, only 355 g. 3D mesh fabric upper (a flexible casing that covers the entire upper for better comfort and breathability) with memory foam around the ankle. Thick, soft foam for a very comfortable tongue.
The "resistance to wear" star test
The shoes are tested in a lab on a machine that has been specially developed to reproduce the type of heel, forefoot, toe, and instep wear that results from tennis play. The more cycles needed to reproduce wear on the shoe, the higher the shoe's resistance rating.
Durability
RUBLAST rubber sole with reinforcements in areas prone to wear. PU reinforcements around the toes and instep to provide a durable upper that withstands slipping.
Outsole durability: 4 stars.
Upper durability: 5 stars.
Cushioning
Midsole made from "compression molded" EVA foam with "diapad 3" insert at the heel to provide durable comfort. In'Up insert at the front of the shoe for more dynamic forefoot cushioning.
PU and EVA insole for durability and lighter weight.
The "cushioning" star test
The shoes are tested in a lab on a machine that reproduces the impact of the heel when playing tennis using an 17.6 lb impactor. The greater the acceleration, the greater the impact suffered by the body.
The "user comfort" star test
The shoes have been blind-tested by a panel of tennis players representing all levels. They evaluated the level of comfort; i.e., how the shoe fits and how soft it is (from the very first time worn) on a scale of 0 to 20.