We tried a lot of different things before landing on this design for our TS9 adapters. We tried both harder and softer cable, and decided our RS100 cable achieved the right balance of durability but also flexibility.
This is a 50 Ohm impedance pigtail (both TS9 and N-type connectors are 50-ohm connectors).
The high quality materials allow for greater than 60 dB shielding, and this high quality adapter is rated for use at frequencies of up to 6 GHz.