Braided Kevlar line is used in a wide variety of applications where a tough, thermally stable, durable line is required due to its:

Toughness - Yields High Strength in Small Size

Every Kevlar fiber is of high tensile strength. It weighs much less when yielding same strength.

A roll of 100ft 700lb braided kevlar only weighs 3.28Oz, ideal choice for outdoor activities.

Construction of Braid

Braiding, Multi-strands interweaving process, makes kevlar line much more durable and be able to resist raveling.

Cut-Resistance

One of the best advantages of Kevlar line.

It helps avoid many unexpected string snaps which happen a lot in binding, fastening objects or uses near sharp edges.

In addition to "resistance" properties, Kevlar line is also highly resistant to abrasion, to chemicals (especially acids, and alkalis.)

Capability to Work at High Temperature

Kevlar doesn't melt and only decomposes at relatively high temperature, which also the reason that it's common material in firefighter PPE equipment.

Low Stretch, Least Creep

Stretch annoys much in applications like stringing hammocks, kite flying control, especially in control of stunt kite or traction kite.

Kevlar line has extremely low stretch, which means the long time loading will create the least creep on it.