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According to fitbit:
"The wristband that comes with Blaze is made of a flexible, durable elastomer material similar to that used in many sports watches. It does not contain latex. Accessory wristbands are available in genuine leather and stainless steel.
The buckle and frame on Blaze are made of surgical-grade stainless steel. While all stainless steel contains traces of nickel and can cause an allergic reaction in someone with nickel sensitivity, the amount of nickel in all Fitbit products meets the European Union's stringent Nickel Directive."
Taken from: https://help.fitbit.com/articles/en_US/Help_article/1983/
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