Performance Swaddle Suit M | Performance Tension

Stage 2 swaddle for babies who are starting to move more

The Performance Swaddle Suit M is designed for approximately 1–3 months, when babies begin reaching, stretching, and moving their arms and body with noticeably greater strength.

It is not simply a larger version of the S size. The fabric, tension, and arm construction are engineered differently to respond to the increased movement, heat, and sleep behavior of a growing baby.

Performance fabric with enhanced breathability and dry comfort

As babies become more active, movement during sleep can also increase heat and moisture around the body.

The M size uses a high-performance yarn engineered for improved airflow, moisture absorption, and quicker drying, helping create a drier and more comfortable sleep environment for this more active developmental stage.

Cotton-like softness inside, cross-mesh ventilation outside

The inner surface is designed with a smooth, cotton-like feel where it meets the baby, while the outer surface features a distinctive cross-shaped mesh structure developed to enhance airflow.

This dual-surface construction balances softness against the skin with enhanced ventilation and moisture release on the outside.

Responsive tension designed for growing movement

From around one month onward, babies often begin extending their arms, twisting their bodies, and moving with noticeably more force.

Performance Tension fabric stretches in response to that movement and then returns to a supportive fit. Rather than tightly restraining the baby, it flexes with natural movement while gently moderating sudden startle-related motions that may interrupt sleep.

Designed to reduce fingernail snagging as activity increases

As hand and finger movement becomes more active, small details around the arm area become increasingly important.

The inside surface around the baby’s hands is designed with a smoother, cotton-like feel to help reduce the risk of fingernails catching in the fabric while the outer cross-mesh structure continues to provide enhanced ventilation.

An arms-up shape for the next stage of development

As babies grow, they increasingly extend their arms toward the face and above the shoulders.

The M size supports this natural arms-up position while combining an adapted arm shape with responsive fabric tension for babies whose movement has become stronger.

Not tighter swaddling — smarter response to movement

More movement does not mean a baby should simply be wrapped more tightly.

MerryTune uses the elasticity and recovery of the fabric to respond to movement: stretching when the baby moves and returning toward a stable fit afterward.

This helps preserve natural movement while gently moderating sudden motions that can disturb sleep.

Freedom for healthy hip and leg movement

Upper-body support is balanced with sufficient room around the lower body. The design does not hold the baby’s legs straight and tightly together.

The swaddle shape is developed with internationally recognized hip-healthy swaddling principles in mind, allowing the hips and legs to move naturally.

Two fabrics for two stages of newborn development

Stage 1 Organic Cotton Air Mesh S focuses on softness, delicate skin, and the smaller movements of the earliest newborn period.

As strength and activity increase, Stage 2 Performance Tension M provides enhanced airflow, moisture management, quicker drying, and responsive tension.

Instead of simply increasing the size, MerryTune changes the fabric and performance structure according to the baby’s developmental stage.

Designed and made in South Korea

Performance Tension M was developed around the changing movement, sleep posture, heat, and fabric-contact needs of growing babies.

The product is designed, developed, and manufactured in South Korea.

Made in South Korea