503C Natural Rubber 30-40mmHg U Medium Full Long M4 Beige

Why Choose Sigvaris 503C Natural Rubber 30–40 mmHg Beige M4 Medium Full Long

M4 differs from M3 in circumference — it sits one step up in the Sigvaris numeric sizing progression, accommodating a larger ankle and calf measurement within the medium length and full width configuration. At 30–40 mmHg natural rubber, circumference accuracy is the most clinically significant specification: natural rubber has less elastic give than synthetic alternatives, which means a garment sized too small generates pressure exceeding the prescribed level, and a garment sized too large fails to apply the intended gradient. M4 is the correct specification for patients whose measured circumferences fall in the upper range of the M3–M4 boundary, where M3 would be too constrictive. Beyond the sizing distinction, the clinical rationale for 503C natural rubber at 30–40 mmHg is identical to M3: strong containment under high oedema load, minimal fabric deformation throughout the day, and durable construction for sustained daily laundering cycles that extra-firm compression demands. Natural rubber provides the firmer shape resistance that patients with significant venous insufficiency and oedema volume need when softer synthetic compression fabrics progressively deform under swelling pressure during the day. Prescription required — clinical fitting essential.

Key Features

✔ 30–40 mmHg extra-firm graduated compression (prescription-level)

✔ Natural rubber construction for strong containment and shape resistance

✔ M4 — Medium Full Long, larger circumference than M3 in the same length/width

✔ Durable natural rubber for sustained daily compression under high-oedema load

✔ Beige — standard discreet medical garment tone

✔ Confirm garment style, toe, and band configuration by exact SKU

Benefits

✔ Correct circumference for patients at the upper M3–M4 sizing boundary

✔ Natural rubber containment resists deformation under high oedema pressure

✔ Extra-firm graduated compression for advanced venous insufficiency management

✔ Full Long coverage accommodates standard and longer leg proportions

✔ Durable construction maintains compression through sustained daily use

Clinical & Typical Applications

✔ Advanced chronic venous insufficiency requiring accurate M4 circumference at 30–40 mmHg

✔ Patients where M3 produces constriction — stepped up to M4 for correct gradient

✔ High oedema volume where natural rubber containment outperforms synthetic alternatives

✔ Post-thrombotic syndrome and venous stasis requiring extra-firm rubber-grade compression

✔ Clinically fitted patients requiring maximum standard-range compression containment at M4

Usage & Care

Don stockings in the morning before rising — 30–40 mmHg natural rubber requires application when oedema is at minimum. Use a donning glove. Smooth evenly throughout with no bunching. Machine wash on gentle cycle in cool water with mild, non-bleaching detergent; hang or lay flat to dry. Do not tumble dry, bleach, or iron. Replace every 4–6 months or when compression consistency diminishes. 30–40 mmHg natural rubber requires prescription and clinical fitting — confirm M4 sizing with accurate circumference measurements before dispensing.