This cultivar from Mildred Seaver of Massachusetts is a  seedling selection of unidentified parentage which was registered on her behalf in 2009 by Kevin Walek (Hosta Registrar). It grows into a giant size hosta about 34 inches in height with a spread of around 51 inches. The foliage is heavily corrugated, broadly ovate and with thick substance. Its near white flowers bloom from late June into July and then set viable seeds.
 

According to The Hostapedia by Mark Zilis (2009), "Mildred Seaver once commented to me that 'Sea Blue Leather' was a significant improvement on 'Sea Blue', an earlier introduction."

The New Encyclopedia of Hostas by Diana Grenfell (2009) states: "Slow to increase...Pruinose bloom soon fades from the upper leaf surface, leaving a pronounced leathery texture."