True-to-Size Millimeter Sizing Comparison
FitFlop Iqushion Sparkle vs FitFlop Lulu Leather Toepost
Detailed size conversion chart, cavity measurements in millimeters, and crowd-sourced fit advice for choosing your perfect size.
Interactive Size Converter
Select what size you wear in the Iqushion Sparkle to see your calculated size in the Lulu Leather Toepost.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Iqushion Sparkle (US) | Internal Cavity | Lulu Leather Toepost Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 3.5 | 240 mm | US 3.5 | 93% | +0.6 mm |
| US 4 | 243 mm | US 4 | 93% | +0.6 mm |
| US 4.5 | 247 mm | US 4.5 | 93% | +0.6 mm |
| US 5 | 250 mm | US 5 | 93% | +0.6 mm |
| US 5.5 | 253 mm | US 5.5 | 93% | +0.6 mm |
| US 6 | 257 mm | US 6 | 93% | +0.6 mm |
| US 6.5 | 260 mm | US 6.5 | 93% | +0.6 mm |
| US 7 | 267 mm | US 7 | 93% | +0.6 mm |
| US 7.5 | 270 mm | US 7.5 | 93% | +0.6 mm |
| US 8 | 273 mm | US 8 | 93% | +0.6 mm |
| US 8.5 | 277 mm | US 8.5 | 93% | +0.6 mm |
| US 9 | 280 mm | US 9 | 93% | +0.6 mm |
| US 9.5 | 283 mm | US 9.5 | 93% | +0.6 mm |
| US 10 | 287 mm | US 10 | 93% | +0.6 mm |
| US 10.5 | 290 mm | US 10.5 | 93% | +0.6 mm |
| US 11 | 293 mm | US 11 | 93% | +0.6 mm |
| US 11.5 | 297 mm | US 11.5 | 93% | +0.6 mm |
| US 12 | 300 mm | US 12 | 93% | +0.6 mm |
| US 12.5 | 303 mm | US 12.5 | 93% | +0.6 mm |
| US 13 | 307 mm | US 13 | 93% | +0.6 mm |
| US 14 | 313 mm | US 14 | 93% | +0.6 mm |
Frequently Asked Questions
How does the Iqushion Sparkle size compare to the Lulu Leather Toepost?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Iqushion Sparkle has an internal fit offset of -0.08mm compared to 0.52mm for the Lulu Leather Toepost.
Do these shoes fit wide feet comfortably?
The Iqushion Sparkle has a standard medium width profile, while the Lulu Leather Toepost is roomy/wide.