Available in marine vinyl, canvas, or crisp sailcloth.  AAS seats were first developed for mad people who want to row the Atlantic (hence the name - AAS stands for Atlantic Arse Saver!).  On these, the straps have moved  inside the cover to cut down on even the slightest strap-chafe risk. 
 
The standard foam inner is a combination of hard and medium recon foam, with a 1cm firm upholstery foam layer on the top.  This can be substituted for a top layer of memory foam if you have a particularly sensitive bottom, for an additional £5. The inner is wrapped in heavy duty plastic, to provide water resistance.
 
Fonts for name or club embroidery shown above.  Specific desired fonts can be found on request.  Embroidery is £5 an end for up to £5 letters, and then charged at £1 a letter thereafter. Decorative embroidery is charged at £10 an end.  Specific image digitisation charge is £12.50.