The adult males of these tiny spiders reach up to 6.2 mm of length, while females are up to 10.3 mm long. 
They can be recognized by the almost circular abdomen and the V-shaped mark on the front of it. 
Agelenatea redii is very variable in color. 
Usually they are red, brown or beige. 
A spider that can look quite similar is the Bridge Spider (Larinioides sclopetarius), but Agelenatea redii is clearly hairier and stays smaller.

They are active very early and can already be encountered from April.
Adult males are found until June, while females, still abundant in July, begin to disappear around August.

Sallandse Heuvelrug National Park, The Netherlands, 7 May 2020