Panel comprising: • a first woven fabric comprising filamentary elements, referred to as warp elements, which are substantially parallel to one another and extend in a direction referred to as the warp direction, which constitutes a first main direction of the first woven fabric, filamentary elements, referred to as weft elements, which are substantially parallel to one another and extend in a direction referred to as the weft direction, which constitutes a second main direction of the first woven fabric different from the first main direction of the first woven fabric; • a second woven fabric comprising filamentary elements, referred to as warp elements, which are substantially parallel to one another and extend in a direction referred to as the warp direction, which constitutes a first main direction of the second woven fabric, second filamentary elements, referred to as weft elements, which are substantially parallel to one another and extend in a direction referred to as the weft direction, which constitutes a second main direction of the second woven fabric different from the first main direction of the second woven fabric; • a linking structure comprising n filamentary elements linking the first woven fabric to the second woven fabric, each filamentary element comprising at least one filamentary portion, referred to as a stay, extending between the first and second woven fabrics and linking the first woven fabric to the second woven fabric, each stay i having an at-rest length h i and extending from a point of attachment to the first woven fabric to a point of attachment to the second woven fabric; at least some of the m stays of the linking structure have an at-rest length that is different from the mean h m of the at-rest lengths of the stays, m representing the total number of stays of the linking structure, characterized in that the difference E, expressed as a %, between the at-rest length h max of the longest stay of the linking structure and the at-rest length h min of the shortest stay of the linking structure, and calculated as E=100 x (h max -h min)/h min, is such that E > A r, where A r represents, as a %, the elongation at break of the stay of the shortest at-rest length, and in that the first woven fabric is plastically deformable in at least one of the first and second main directions of the first woven fabric so that the distance between the two points of attachment of each stay i is substantially equal to its at-rest length h i. • a first woven fabric comprising filamentary elements, referred to as warp elements, which are substantially parallel to one another and extend in a direction referred to as the warp direction, which constitutes a first main direction of the first woven fabric, filamentary elements, referred to as weft elements, which are substantially parallel to one another and extend in a direction referred to as the weft direction, which constitutes a second main direction of the first woven fabric different from the first main direction of the first woven fabric; • a second woven fabric comprising filamentary elements, referred to as warp elements, which are substantially parallel to one another and extend in a direction referred to as the warp direction, which constitutes a first main direction of the second woven fabric, second filamentary elements, referred to as weft elements, which are substantially parallel to one another and extend in a direction referred to as the weft direction, which constitutes a second main direction of the second woven fabric different from the first main direction of the second woven fabric; • a linking structure comprising n filamentary elements linking the first woven fabric to the second woven fabric, each filamentary element comprising at least one filamentary portion, referred to as a stay, extending between the first and second woven fabrics and linking the first woven fabric to the second woven fabric, each stay i having an at-rest length h i and extending from a point of attachment to the first woven fabric to a point of attachment to the second woven fabric;