Puma introduced L.I.F.T., Light Injected Foam Technology, and the L.I.F.T. Racer built on it. The design target was weight, and the result comes in at around 173 grams.
The midsole
The midsole is made by a two-color EVA injection process that wraps the foam around the entire upper rather than sitting beneath it as a separate layer.
That construction is what delivers the weight saving. A conventional shoe joins a midsole to an upper, and the join needs material. Wrapping the EVA around the upper removes that interface, producing a shoe that is lightweight, low profile and ergonomic in one piece.
The upper
The upper combines micro suede trim detail with an oval mesh chosen for maximum breathability.
The assembly method is worth noting. The breathable mesh is stitched onto the upper using a reduced quantity of glue, which is both an environmental choice and a weight one. Adhesive is heavier than it appears once it is spread across a whole shoe.
What it is for
The Racer is ergonomically designed for runners adding short distances to a workout, rather than for long-distance running. That distinction is real: a shoe this light necessarily carries less cushioning material, which suits shorter efforts and suits them well.
It was also positioned as versatile enough to wear generally, and released in bright colors.
Frequently asked questions
What does L.I.F.T. stand for?
Light Injected Foam Technology.
How light is the shoe?
Around 173 grams.
What distance is it designed for?
Short distances within a workout. Very light shoes carry less cushioning, which suits shorter runs.
This report dates from 2009.
