Canadian brand Chenna Baree has come out with a new line of insoles! They are flat, flexible, and offer a better fit for wide toebox shoes. You can trim them to fit just right, since the felted wool is not molded. 

• Designed for shoes with a wide toe box
• For an extra wide barefoot fit, choose a larger size and trim to your needs
• Flat insoles without arch support are a chance for you to develop for function internally
• Flexible insoles let your feet bend and move as much as your shoe allows
• Made of wool with natural rubber base to help them stay in place.
• Available in a few sizes, trim to fit! 
• Wool is naturally antimicrobial and thermoregulating.
• Adjust the volume of your barefoot shoes by switching out or layering insoles.