https://www.facebook.com/WillsWing/posts/10156609850424426

Steve Pearson writes:

The white laminate is "UVPXW10" which has been available for many
years and is now included in the lowest option level T3. It's extraordinarily
durable with great in-flight visibility but structurally can't match the low
stretch performance of the Technora laminates UVODL04/06. UVODL04/06 are
included in the race and team editions. You can't tell any difference in
handling and I can't imagine a significant difference in performance so I often
recommend that configuration for anyone other than top comp pilots.

A big part of it is the cost difference. This UV polyester laminate is more than
3x the price of woven, the UV Technora laminates are 50% more. T3s handle the
same with either but benefit from the extra stiffness of Technora to control
twist. Technora is overkill (doesn't add any value for performance or
durability) on models with less tension in the sail. Most T3s have heavier
technora (UVODL06) on the leading and trailing edge (where you see white) and
lighter technora (UVODL04) in the panel between. The carbon tape is even stiffer
and stronger than the technora and manages off-axis loads.