The Spire Health Tag, available as a single tag for $50, a 3-pack for $129, or an 8-pack for $299, tracks sleep, stress, and activity. It's meant to be an activity tracker that you can forget about, clipping it onto a shirt or pajamas and then not worrying about it again.
It's sold in multiple packs so you can keep one attached to each of the clothing items that you use most often. It's small enough that it can clip into the waistband of a pair of pants or attach to the strap of a sports bra.
The Health Tags can be washed, so you can clip one to a piece of clothing and leave it there permanently if desired, for no-hassle tracking and no device to worry about. Health Tags feature a 1.5-year battery and don't need to be recharged.
Spire Health Tags measure activity, heart rate and heart rate variability, sleep quality, breathing patterns, and stress levels to offer up an overall picture of a person's health.
According to TechCrunch, Apple retail stores will be offering the Spire Health tags in one, three, and eight pack configurations, with stores set to get the new accessories soon. The Spire Health Tags will also be available on Apple's website, but aren't showing up just yet.
Apple also sells Spire's Mindfulness and Activity Tracker, a $130 activity tracker that clips to your clothing and senses respiratory patterns to detect changes in your state of mind.