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La Sportiva to Merrell shoe size

The short answer

La Sportiva 39.5 is Merrell 8 by the two brands' own charts.

At least one of the two brands publishes no foot length, so the rows line up the US size both charts print. Treat it as the label conversion, not a fit.

Every La Sportiva size read across to Merrell. EU sizes on the left, US women's on the right.
La SportivaMerrell, by chartSame labelMerrell also prints
365.5not publishedUS men's 4 · UK 3 · EU 35.5 · CM / JP 22.5
36.55.5 or 6not publishedUS men's 4 · UK 3 · EU 35.5 · CM / JP 22.5
376not publishedUS men's 4.5 · UK 3.5 · EU 36 · CM / JP 23
37.56.5not publishedUS men's 5 · UK 4 · EU 37 · CM / JP 23.5
387not publishedUS men's 5.5 · UK 4.5 · EU 37.5 · CM / JP 24
38.57.5not publishedUS men's 6 · UK 5 · EU 38 · CM / JP 24.5
397.5 or 8not publishedUS men's 6 · UK 5 · EU 38 · CM / JP 24.5
39.58not publishedUS men's 6.5 · UK 5.5 · EU 38.5 · CM / JP 25
408.5not publishedUS men's 7 · UK 6 · EU 39 · CM / JP 25.5
40.59not publishedUS men's 7.5 · UK 6.5 · EU 40 · CM / JP 26
419.5not publishedUS men's 8 · UK 7 · EU 40.5 · CM / JP 26.5
41.59.5 or 10not publishedUS men's 8 · UK 7 · EU 40.5 · CM / JP 26.5
4210not publishedUS men's 8.5 · UK 7.5 · EU 41 · CM / JP 27
42.510.5not publishedUS men's 9 · UK 8 · EU 42 · CM / JP 27.5
4311not publishedUS men's 9.5 · UK 8.5 · EU 42.5 · CM / JP 28
Neither chart publishes the body each size is built for, so the rows line up the labels. Tinted rows change label or sit between two sizes. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.

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Sources

Merrell to La Sportiva