miR 3 Pieces 3 lb Cast Iron Weights for Weighted Vest, Flat Low-Profile 9 lb Total

miR’s Set of three 3 lb iron weights provides a compact, durable 9 lb boost designed to fit miR short, pro, narrow, women’s, airflow vests, shorts and belts.

These solid cast-iron inserts were made so athletes and fitness enthusiasts can fine-tune the load in miR wearable resistance gear without replacing the whole vest. Each weight measures 4" x 2.5" x 1.5" and carries the official miR stamp, so you get consistent, reliable mass that slides into compatible pockets. Use them in pairs or all three together to incrementally increase training intensity, or in other brands’ vests if the pocket dimensions allow.

How do these weights change my workout feel?

Adding one or more of these weights increases overall resistance, which can intensify cardiovascular sessions, strength circuits, and functional movement training. The compact, flat shape keeps the load close to your torso for balanced distribution and minimal bouncing.

• 3 weights, 3 lb each — add 3, 6, or 9 lb total.
• Flat, low-profile dimensions for stable fit in pockets.
• Cast iron density gives predictable, centered mass.

Will these fit my miR vest, shorts, or belt?

Yes — they are engineered to be compatible with miR short, airflow, pro, narrow, and women’s models, plus miR shorts and belts. The dimensions match miR’s pockets for a secure, snug fit with minimal shifting during activity.

• Official miR-stamped weights for authentic compatibility.
• Dimensions 4" x 2.5" x 1.5" to match miR inserts.
• Slide-in design for fast adjustments between sets.

Can I use these weights with non-miR vests?

Potentially — they will work in other weighted vests or belts if the pocket size accommodates the 4" x 2.5" x 1.5" block. Check pocket dimensions and closure type to ensure a stable fit before high-intensity use.

• Measure pockets before purchase for a secure fit.
• Works best in vests with wide, flat pockets and tight closures.
• Not recommended if pocket allows excessive movement or rotation.

How should I care for these iron weights?

These are low-maintenance cast-iron pieces: keep them dry, wipe clean after heavy sweat exposure, and store somewhere dry to prevent surface rust. If any corrosion appears, a light wire brush and thin oil layer will restore the finish without affecting performance.

• Wipe with a dry cloth after use to remove moisture.
• Store indoors to avoid rusting in humid environments.
• Inspect pockets and seams regularly for wear from repeated insertions.

Who is this for? This set is ideal for athletes, trainers, and anyone who already owns miR wearable resistance gear and wants flexible, incremental weight options without swapping vests. It’s also a good choice for users of other weighted vests who need compact, dense weight blocks that fit larger pockets. Choose this set if you want durable iron inserts with precise dimensions, an official miR stamp, and the ability to quickly adjust resistance between workouts.