http://www.willswing.com/blogs/PilotBlogs/tabid/38/Default.aspx

We introduced fabrics based on high-strength PEN and Technora
fiber over a year ago. High strength and stiffness are essential to control
twist and prevent trailing edge flutter especially as gliders age. PEN and
Technora fabrics offer significant advantages over the popular ‘PX’
polyester-based styles. Our PEN-based fabrics weigh 180 gms/m^2, match the
structural performance of PX15T (270 gms/m^2) and exceed the common PX10T style
(230 gm/m^2) typically used on trailing edge panels. ODL Technora-based fabrics
are even stronger with a 20% weight savings compared to PEN.

The lighter weight of these PEN and Technora based fabrics allow us to make the
entire sail body from high strength fabric which is important because some of
the highest sail loads are in the interior panels at VG tight.

Altogether, we can rank the fabric attributes in the following order:

1. Appearance and fashion – up to you

2. Ranked in order of structural performance (strength, stiffness and weight)

1. ODL06

2. UVPT10 (New PEN-Technora hybrids)

3. PE10

4. PX10T

5. Woven sails (V170/205MT/Hydranet)

3. Ranked in order of higher UV stability and longevity

1. UVPT10, Woven sails.

2. PE10, ODL06

3. PX10T

4. Ranked in order of nicer flight characteristics

1. UVPT10, PE10, ODL06 are equivalent

2. Woven sails

3. PX10T

5. Ranked in order of low price

1. Woven

2. PX10T

3. PE10

4. UVPT10

5. ODL06