Arlet is a modern Golden Delicious-style apple, developed in Switzerland. It was patented in 1989, but the original cross between Golden Delicious (seed parent) and Idared was carried out in the 1950s. In appearance it more closely resembles Idared, with a yellow skin color overlaid with large areas of red. The flavor is pleasant and juicy, reasonably well balanced between sharp and sweet, but essentially mild.
Arlet was grown commercially on a limited scale in the 1970s, but is now primarily grown by gardeners. It is probably more popular in the USA than Europe, and is known as Swiss Gourmet.
It ripens in early September, and keeps well - not surprising given that both Golden Delicious and Idared are noted for being long keepers.