Put the headers through your Feather or any device and then you can not only plug them into a solderless breadboard, but you could attach circuitry on top as well. They stack and are ideal for through-hole mounting.
1 x Adafruit Stacking Headers for Feather- 12-Pin and 16-Pin Female Headers
15 Days Warranty
This item is covered with a standard warranty of 15 days from the time of delivery against manufacturing defects only. This warranty is given for the benefit of Robu customers from any kind of manufacturing defects. Reimbursement or replacement will be done against manufacturing defects.
What voids warranty:
If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.