Duna OS04 MASK – X060 Orthotic 9

Rear-Opening Shoe for AFO Use

The Duna OS04 MASK Orthotic 9 is an ankle-height orthopaedic sports shoe designed to work in direct synergy with Ankle-Foot Orthoses (AFOs). Featuring a rear-opening construction with a BOA® fastening system, this model supports easier donning while maintaining controlled alignment and stability during walking. Constructed with a lightweight multi-density EVA sole and a flat orthotic-ready footbed, the OS04 MASK is intended for children who require structured footwear to be worn in conjunction with bilateral AFOs, where precise fit and orthotic integration are a priority.

Support Features

Mid ankle support zone to provide structured foot containment when worn with AFOs
Intermediate heel and ankle support with extended stiffeners to assist AFO stability and alignment
Midrange sole flexibility to promote stable stance while supporting forward gait progression
Lightweight construction to reduce fatigue during orthosis-assisted walking
Grain leather upper with breathable mesh panels for structure, durability, and airflow
Multi-density EVA sole designed to guide heel strike and controlled roll-through
BOA® fastening system with rear opening for quick, secure, and easily adjustable closure
Flat innersole construction suitable for AFO footplates and orthotic integration
Adjustable sole design allowing modification to support individual postural and gait needs

Ideal For Children With

Bilateral AFO use requiring a rear-opening shoe
Neurological conditions affecting motor control and postural stability
Reduced rearfoot control requiring structured heel containment
Gait patterns requiring guided progression and controlled roll-through
Difficulty donning standard closed footwear over orthoses

Clinical Insight

The rear-opening structure allows the foot and orthosis to be positioned together before fastening, improving consistency of alignment and reducing strain during donning. Extended heel stiffeners provide rearfoot containment, while the multi-density EVA sole supports controlled progression through stance, contributing to a more efficient and stable gait when used with an AFO.

Feature	Description
Category	Footwear for AFOs > Shoes
Support Zone	Mid Ankle
Height (cm)	Size 22: 6.3 cm · Size 25: 6.9 cm · Size 30: 8.5 cm · Size 35: 9.0 cm · Size 45: 11.0 cm
Heel / Ankle Support	Intermediate
Sole Flexibility	Midrange
Weight Class	Lightweight
Upper Materials	Nubuck leather with mesh panels
Lining	Natural leather
Sole	Multi-density EVA sole, easy to modify if required
Innersole	Flat footbed suitable for AFOs
Fastening	BOA® fastening system with rear-opening construction (dial positioned laterally)
Key Features	Rear opening, extended heel stiffeners, adjustable sole, generally not suitable for unilateral AFO use
Size Range	Available to order: EU 26–46
Width Fitting	Orthotic 9 (refer to Duna size chart)
Split Pairs	Split pairs in size and width available to order (surcharge applies)
Colour Customisation	Custom colours available to order (surcharge applies)
Delivery Timeframe	Allow 8–10 weeks for out-of-stock or backordered items
Country of Origin	Italy

Duna Size Chart

Ensure that you follow this link to find out How to measure feet and for a Guide to Choosing the Right Size Shoe.

Please note:

Duna has a number of size charts so please consult the size chart for the model you are ordering.
Duna footwear requires more measurements to be taken to select the correct size. See the size chart and foot diagrams, on where to take the measurements, below.

Size	Orthotic 9 "Wheel"
	E Length	F Width	A C/Ffoot	B C/Mfoot	C C/Heel
20	13.5	5.8	16.7	17.5	23.0
21	14.2	5.9	17.2	18.0	23.8
22	14.8	6.1	17.7	18.5	24.5
23	15.5	6.2	18.1	19.0	25.3
24	16.1	6.4	18.6	19.5	26.1
25	16.8	6.6	19.1	20.0	26.8
26	17.4	6.7	19.5	20.5	27.6
27	18.1	6.9	20.0	21.0	28.4
28	18.7	7.0	20.5	21.5	29.1
29	19.4	7.2	20.9	22.0	29.9
30	20.0	7.4	21.4	22.5	30.7
31	20.7	7.5	21.9	23.0	31.5
32	21.4	7.7	22.4	23.5	32.2
33	22.1	7.8	22.8	24.0	33.0
34	22.7	8.0	23.3	24.5	33.8
35	23.4	8.2	23.8	25.0	34.5
36	24.0	8.3	24.2	25.5	35.3
37	24.7	8.5	24.7	26.0	36.1
38	25.3	8.6	25.2	26.5	36.8
39	26.0	8.8	25.6	27.0	37.6
40	26.6	9.0	26.1	27.5	38.4
41	27.3	9.1	26.6	28.0	39.2
42	28.0	9.3	27.0	28.5	39.9
43	28.7	9.4	27.5	29.0	40.7
44	29.3	9.6	28.0	29.5	41.5
45	30.0	9.8	28.4	30.0	42.3
46	30.6	9.9	28.9	30.5	43.0