Question 1

Is the Umbra Strata 01 legal for road racing?

Accepted Answer

Yes. World Athletics caps road racing shoes at a 40 mm stack height measured at the heel. The Strata 01 measures 39 mm at the heel, one millimetre under the limit, so it is eligible for sanctioned road competition.

Question 2

How much does the Umbra Strata 01 weigh?

Accepted Answer

168 grams for a half pair in EU 43. That figure covers the complete shoe: the 42 den mesh upper, the 1.0 mm thermoplastic heel cradle, the 0.9 mm carbon plate and the supercritical PEBA core.

Question 3

What is the stack height and drop of the Umbra Strata 01?

Accepted Answer

39 mm at the heel and 31 mm at the forefoot, giving an 8 mm heel-to-toe drop. Both figures are measured on a half pair in EU 43, and the drop is the difference between the two stack heights rather than a separate measurement.

Question 4

What carbon plate does the Umbra Strata 01 use?

Accepted Answer

A full-length 0.9 mm plate of unidirectional carbon tape, laid at 0 and plus-minus 45 degrees and cured to the angle of toe-off. Measured bending stiffness is 38 N/mm in a three-point test over a 50 mm span. There is no shank.

Question 5

When does the Umbra Strata 01 release and what does it cost?

Accepted Answer

It releases on 12 March at 09:00 CET at 289 euro, in EU sizes 38 to 47. Registering an email on the product page sends one notification 24 hours before the drop and nothing else.

Umbra Strata 01 — carbon-plate road racing shoe

Thirty-one grams
per square metre

Thirty-nine millimetres. One under the limit.

A sheet that
bends one way

Strata 01

Umbra Strata 01 — carbon-plate road racing shoe

Thirty-one gramsper square metre

Thirty-nine millimetres. One under the limit.

A sheet thatbends one way

Strata 01

Thirty-one grams
per square metre

A sheet that
bends one way