They come in 3 different shaped net frames. The round Belmont, the "D" shaped Seaforth and, finally, the bow shaped Errol.
Each frame is 20"wide and has an overall reach of 52" that when folded is 20". The net is approximately 16" deep with a pan shaped bottom that is 18" wide. The net bag is a woven combination of D210, D400 and D600 polyester that is both strong, yet soft to touch and is mildew resistance. It is resistant to stretching, shrinking and resists pilling (bobbling).
The photograph show both the Lakeside 20 (on the left) and Lakeside 16 landing nets with these net bags; this page is for the Lakeside 20 landing net only.